Basics
Classes and races
What your class and race are, and what they change.
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Every pirate has a class and a race, both drawn at random when you create your adventure. Your profile shows them with /profile view.
Your class sets your line of 
weapons: each class has its own weapon names, and you move along that line as you train. Weapon damage does not depend on the class.
See /train weapon to upgrade your weapon and /train stats for your current one.
Your race decides which Haki you start with: each race begins the adventure with points in one of the three Haki (observation, armament or conqueror).
This head start only matters early on. You can train every Haki later with the Will Points you earn by leveling up. See Experience and levels.