How is the rotation you use?

Thank all of you !!! Helped a noob one !! Ahahahahhaaha

Im not good with mmorpg and these skill things and all. I was just happy in Ord Mantell when there war no skills stuff, but when i reached the republic fleet ive got to confront them. I choose vanguard, now i dont know what of all those skills i must get ( the crew skills). There are one that is better or something like ? My other question is about the Skill Tree, i choosed to be an Assault Specialist, but i dunno what choose and all. If someone here can be extremely pacient and try to help me, id be extremelly greatfull. (my english sucks, use the force to read.)