This is a guide to what the base stats should be of quests that you accept based on your level, in order to maximize exp and stat gain.
The format used for base quest stats will be base attack | base strg | base accy | base hp, and the format for weapon stats will be damage / accuracy.
When you hit level 20, the guide will give options for maximizing money gained from quests, and maximizing exp and stats gained from quests. Since most people maximize EXP and stats, the maximizing money route is less accurate.

Levels 1-2:
Do 1 1 1 30 quests with the dagger weapon.

Levels 3-6:
Do 1.5 1.5 1.5 30 quests with dagger, or you can do 2 2 2 30 quests using a 5/86 weapon.

Levels 7-10:
Do 2 2 2 30 quests using a 5/86 weapon.

Levels 11-15:
Do 2 2 2 30 quests using a 7/86 or 8/86 weapon.

Levels 16-20:
Do 2 2 2 30 quests using a 10/86 weapon.

Levels 21-30:
Do 2 2 2 30 quests using a 10/86 weapon, or 3 3 3 40 quests using a 15/86 weapon.

Levels 31-45:
Do 2 2 2 30 quests using a 12/86 weapon, or 3 3 3 45 quests using a 17/86 weapon.

Levels 46-55:
Do 2 2 2 30 quests using a 15/86 weapon, or 3 3 3 45 quests using a 20/86 weapon

Levels 56-65:
Do 2 2 2 30 quests using a 17/86 weapon, 3 3 3 45 quests using a 22/86 weapon, or 4 4 4 60 quests using a 25/86 weapon.

Levels 66-75:
Do 2 2 2 30 quests using a 20/86 weapon, 3 3 3 45 quests using a 25/86 weapon, or 4 4 4 60 quests using a 28/86 weapon.

Levels 76-80:
Do 2 2 2 30 quests using a 22/86 weapon, 3 3 3 45 quests using a 27/86 weapon, 4 4 4 60 quests using a 28/86 weapon, or 5 5 5 60 quests using a 32/86 weapon.

Levels 81+:
Do 2 2 2 30 quests using a 22/86 weapon, 3 3 3 45 quests using a 30/86 weapon, 4 4 4 60 quests using a 30/86 weapon, or 5 5 5 60 quests using a 35/86 weapon.

Coming soon!