Yes you automatically have 12x xp as a sub, you can deactivate it if you want.
Legacy levels are across all characters but a level 10 character doesn't equal legacy 10 (from memory) it wont take long to get legacy 10
its called slow release medpac. With the latest patch a lot of changes have gone through on healers but its still there.
either the class storyline or just go buy one off the GTN, they're not expensive for some of the cartel market ones - you'll need to put hilt, mods, enhancement in but again at low level those are cheap.
Cheers was just checking I hadn't missed it somehow.