Mate, you pick a class, it has perks. Its advised you make the most of them depending on how you game:
Example 1: i am a dueler... why? because i want your money... Example 2: I am a builder... why? because i want to build cities Example 3: I am a soldier... why? well generally because i have an incredible grudge against duelers...
Etc and so forth... just because you pick a class does not necessarily mean you need to re-enact it. Do whatever you will... if you pick soldier check his perks... or better still check this:
weststats
And just like that... the world was created...