Where do you get the power core for the assembly chamber in jedi temple ?

Yes I agree, I also don't understand why they havn't made the game so you can contine to reply missions that arn't part of the main story.

So should we complete all missions in fleet before going to next planet ?

Ah found answer. I had to go back to fleet space port and to where I docked after finishing mission on the planet I started on it is then first mission NPC I See, would be nice if game set me this as a mission.

Where do I get the class quest from, say on site I should get a mission to got to a advanced trainer but I didn't get one I am level 12