what class? It's up to you building the char to be pure dps (maxing attacking traits) or pure support (maxing heals and support traits) or mix and match to combo with your weapon and utility skills.

http://gw2skills.net/editor/en/

Try it out here.

got new update .... but small one.

i've already answered this a few times.

affect all skills one

NO, JUST NO! 

Let's all join a low populated server!