Im a vangaurd and I was wondering if you get a jedi as a companion?

I am having a lot of trouble beating the coliocoid master. I am a level 22 and i can just get close to beating him but i Cant beat him. Is there attacks that work better on him or something different. Please help me, i have to beat him.

where do i find the comedation vendors. I have like 30 comenndations and i cant figure out where to sell them. Im currently on balmora annybody out there eho can help.

On korriban there is a mission called the ALTAR OF SKULLS or BONES, ive got the skull but when i go to the pool of blood i go in the pool but nothing happens the skull is not in my invitory what do i do?