There are not much gear options here. Grab your Paradise physical set and Paradise weapon here: (moc_para01 110, 79).
They do not differ much in ATK but have different size penalties and attack speed, but I would recommend to choose mace.
Also do not forget about Paradise Shadow set which has nice bonuses.
To study full skills list and descriptions please follow this link.
Cart Revolution
Your main damage skill.
It does 150~250% ATK in 3x3 AoE within melee range.
Damage depends on current weight of cart: heavier cart means more damage.
You can easily fill your cart with meat which could be bought from Butcher to increase your damage.
Note this skill always pushes targets to the left, so if you corner your opponents near the wall you can do a lot of damage pretty fast.
Mammonite
This is best single target damage per second skill among first jobs, but every cast of this skill will spend your zeny.
Use it to do burst damage.
I do not recommend to use it every time if you are not rich enough because this skill can spend 5000 zeny within one second of fight.
GIF
Crazy Uproar
It is nice buff that increases your damage. There are not any reasons to ignore it.
Also please note this skill has somewhat longer cooldown, so if you die too frequently you will have to wait to recast it.
Tactics
Ctrl-clicking
Merchants do not have good flee rate or attack speed, but they hit hard and you can use this with your auto-attack build.
Mobbing with Cart Revolution
Mobbing is tactic when you take aggro of several opponents so they groups against you; then you kill them with Area of Effects attacks.
This tactic should be used carefully because it can be dangerous for you and your partymates (or even unlucky strangers).
Stats
If you are going to level up with Cart Revolution you will have to increase your vitality to be more tanky and durable to stand against several opponents at the same time.
VIT also will increase HP restoration from items like Orange Potion (502).
Level 50
Stat
Auto-attack
Cart Revolution
STR
40
43
AGI
55
30
VIT
1
40
INT
1
1
DEX
20
20
LUK
1
1
Blacksmith Leveling
Blacksmiths do not gain any offensive skills, but they have more buffs options to increase their damage output. They are basically advanced Merchants.
Equipment
Again there are not much solid options besides Paradise equipment.
Now we should choose between Paradise Blacksmith Axe (520011) and Paradise Blacksmith Two-Handed Axe (620011).
One-handed axe is great for Cart Revolution damage, also it has higher ASPD than two-handed.
Two-handed axe has higher basic damage and higher critical potential which makes it great for auto-attacking enemies.
Core Skills
To study full skills list and descriptions please follow this link.
Weapon Perfection
This is very powerfull buff which nullifies weapon penalty.
You need to make a habbit to use it all the time despite the fact that the duration is quite short.
This becomes especially relevant because axes have poor size modifiers and they are becoming our main weapons.
Power-Thrust
Nice addition to our damage.
Make sure Power Thrust is always ON.
Adrenaline Rush
This skill increases ASPD for characters wielding maces and axes, which are our main weapons.
Again there are no reason to not sustain it all the time.
Tactics
Buff your partymates
Adrenaline Rush, Weapon Perfection and Power-Thrust are affecting all your partmates.
Do not forget to help them and share your buffs!
Understanding Maximize Power
All damage has some interval [min; max] in which it could be rolled with each attack.
This skill makes all your attack to be max rolled.
Actually this could be quite a big advantage in terms of damage per second which can be used in competitive situations like MvP hunting.
Also it helps a lot when you need to compare damage of your skills or builds.
Note this skill is toggleable and consumes SP over time, so if you have SP problems you do not want it to be active all the time.
Hammer Fall is AoE Stun
This could be great contribution to mobbing tactics at lower levels when you can apply stunes easily.
This skill has high chance to stun enemies and has Area of Effect, so you can use it while mobbing to live longer happy life.
Also it looks cool.
Greed helps a lot
This skill is OP when you play without autoloot (for any reason, like your server do not have that option).
You save an insane amount of time on lifting dropped items.
Please note this skill is disabled in cities and it doesn't affect protected loot.
Stats
May be my readers will have questions why so little DEX is used.
Auto-attack build uses LUK for CRIT which also gives HIT. Weaponry Research gives 20 more HIT. Adrenaline Rush also gives 20 more HIT. Paradise Manteau (480103) gives 2~20 more HIT. Paradise Shadow Armor (24689) gives 5 more HIT.
This way you can have even 1 DEX and still hit enemies with ease.
Also feel free to experiment with stat build or to make it under your needs and circumstances.
Level 99
Stat
Auto-attack
Cart Revolution
STR
64
96
AGI
99
60
VIT
1
60
INT
1
18
DEX
20
35
LUK
65
1
Whitesmith (aka Mastersmith) Leveling
I guess there is no need to explain why all characters besides babies should be rebirthed.
With rebirth you gain more skills, more stat points, more MaxHP% and MaxSP%.
Also only rebirthed characters could reach 4th jobs where all the fun begins.
Whitesmiths are pretty much the same as Blacksmiths but with some nice additions which would be explained further.
Equipment
At this stage we finally are getting some options in terms of equipment thought you still can use just Paradise items.
Malangdo Enchantments are optional. This axe has nice ASPD bonus, high ATK rate and some defensive bonuses. Also this axe could be shared with Biochemists. Note sometimes it has autocast which can push enemies away from you (it could be bless or curse).
Those boots are choosed for their slot, thought any boots with slot for card will actually do. Cards here are increasing Cart Revolution damage by a hefty amount.
Core Skills
To study full skills list and descriptions please follow this link.
Cart Termination
Also known as High Speed Cart Ram, this skill provides high single target DPS which is quite good even at 3rs jobs. Basically this is more powerful version of Mammonite which requires Cart equipped and Cart Boost buff to be active. Do not forget it, it is important! Also note cart weight affects skill damage, just like it was with Cart Revolution. This skill can stun targets.
Cart Boost
This skill provides some movement speed bonus comparable to unmounted AGI UP effect. Note duration is quite short, also you can not cast this skill without cart, obviously.
Maximum Power Thrust
This is Power-Thrust, but has better effect and longer duration. Each cast spends zeny, but considering it's effect and duration price is quite affordable. Note also that this skill will pay off with an active game. This skill can not be active together with Power-Thrust, it has higher priority and will always replace Power-Thrust. Power-Thrust itself still could be applied to your party, so do not forget it.
Tactics
Meltdown
Made for PvP purposes, this buff also affects PvE targets, having a chance to lower targets' defense and attack. It could be used to fight tough targets like MvP.
Upgrade Weapon
This is signature Whitesmith's skill. You can refine weapons with usual (not cash shop) ores (such as Oridecon (984)) more effectively than any NPC could. This is very great when making Safe to +10 Weapon Certificate (6993) on an industrial scale. Note this skill effect depends on your job level, and you need job level 70 for best results. Mechanics and Meisters always have maximum effect of this skill.
Mechanic Leveling
Melee branch
Equipment
At this stage we finally are getting some options in terms of equipment thought you still can use just Paradise items.
To study full skills list and descriptions please follow this link.
Axe Tornado
Damage
[(1100 + (VIT * 2)] * (BaseLevel / 100) % ATK
FCT
None
VCT
None
ACD
0.5s
CD
2s
This skill is only Mechanic's melee AoE attack skill.
It's Area of Effect is 7x7 cells around the user.
Long cooldown do not let to spam fast with this skill, but cooldown could be lowered by equipment.
Cart Revolution 
Mammonite 
Crazy Uproar 
Weapon Perfection 
Power-Thrust 
Adrenaline Rush 
Maximize Power 
Hammer Fall is AoE Stun 
Greed helps a lot 
Cart Termination 
Cart Boost 
Maximum Power Thrust 
Meltdown 
Upgrade Weapon 
Magma Eruption 
Mado Gear License 