i just started a few weeks ago as well. canderous ordo is the highest pop server, it's the only one i ever see reach very high to full status at peak hours (it's also where I play). I have a lvl 25 sith assassin which is the mirror to the shadow. It's a good class and can stealth through many quests as well as solo most of the 2+ quests, especially once it gets its CC, a sap like ability from stealth. I recently switched to a sith sorcerer and it's even easier and can solo some 4+ quests, though enrage timers on the bosses can be problematic.