Here's the guide, hope it helps

You must keep rolling until you get INT 4, LUK 4. STR & DEX doesn’t matter.

From level 1 to 10

Stay in Maple Island and kill snails/mushrooms till u reached level 10.
Make sure that you have at least 35 STR when you reach level 10.

When your character reaches level 10, take the ferry from  maple stroy mesos Island to Victoria Island.
Look for the white taxi, and choose Perion as your destination. When you get to Perion go to the top of the map and enter the portal and talk to Sitting Bull. Congratulations! You are now a warrior! You will have 1 SP, add it to improve hp recovery.

Personal advice - when I reach level 10, I have 15 DEX and the rest = STR

From level 10 to 30 - AP build
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Just make sure u have 40-45 DEX when u reached level 30, so that u will not have a hard time passing the test. Buy some dex potions before u go to take the 2nd job advancement test. The fire boars and lupins are weaker than the one’s u see outside. You will pass the test easily. The rest all put into STR.

From level 10 to 30 - training ground

These are the suggested level corresponding to the training ground.
If you want to go other places and/or go to these places earlier/later, it’s your choice =)

10 - 15: Green slimes in Green Slime tree, 3 screens west of Ellinia.

15 - 21: Pig and Ribbon Pig in Pig Beach

22 - 27: Mushrooms in a tree 3 screens west of Ellinia, blue bubbling in B1

28 - 30: Undead and horned mushrooms found in the Ant tunnel 1,

From level 10 to 30 - SP build

Every level after u did your 1st job advancement, u get 3 SP

Level 10 - 1 SP into Improving HP Recovery (you get 1 SP after u did your 1st job advancement)
Level 11 - 3 SP into Improving HP Recovery
Level 12 - 1 SP into Improving HP Recovery, 2 SP into Improving Max HP Increase

The above build is due to Improving Max HP Increase Pre-requisite, Improving HP Recovery level 5. Improving Max HP Increase let you have additional hp increase when u level up or put AP to HP. So you must max this skill ASAP so that u have more HP.