It's basically going through the companion page, unlocking new companions. Increasing rep with the generals to unlock more companions and quests. Do weekly and daily quests for gear and run heroics for more gear. You get so many crystals for gear and items it's crazy. I'm already looking at buying gear to strip mods out of. Spam diplomacy crewskill to level companions. The new companions have quests as well when they reach certain levels of influence.