That's no problem. General idea on the back story,
Its 4,000 years before the first movie (give or take), The Republic is very fragile, the Jedi are basically extinct and the Sith made a dangerous come back, hunting and killing many of the last Jedi. There's been a lot of really big wars recently, the Great Sith War was the first, then the Mandalorian War, which saw a Jedi named Revan lead a very large number of Jedi away from the order to fight the mandalorians, as the council wouldn't act. Every Jedi that followed Revan either died or turned to the Dark side, Revan and his apprentice Alek included. Darth Revan as he became, went on to lead a deadly war, but he was a military genius and possibly the most powerful force user of his era. Eventually the Jedi attacked him on his flagship, while they were attacking, his apprentice, Darth Malak attacked him too, seemingly killing him. Truth be told, he was arrested by the Jedi and the council wiped his memory, putting him under the care of Bastilla Shan, a female Jedi Knight, one of the Jedi that had attacked his ship.
If I'm not making much sense I can give you some links to sites that might explain it better, want me to PM them to you?