Bless his heart tho runnin his mouth about stuff he knows absolutely nothin about. Then comin in here lookin for answers, so he can watch the 7th installment, and still not know or understand what he's seein.
Truth is sunshine, there's WAY too much history out there, both active and inactive, across multiple forms of media for you to get short answers to your questions and still get everything. I've devoured tons of this franchise for 25+ years and still don't know all the details.
Best bet is to watch all 6 films, Clone Wars cartoon, the new Rebels cartoon, and the new books that are out. Then you're ready for 7.