A bit confused about the classes

[sfang]

I want to make my a rouge and have him/her be a trapper. Am I going to have to branch off of rouge and assassin or just rouge? Or is there no branching involved in this game? (which I doubt...)

[septembers]

Level 10 you become a rogue then once you reach level 30 you can either become a trapper or an assasin.

You get to keep your rogue skills.

[ryan31394]

Keyword: Either

[raychen]

Keyword: Lazy