Fatal Alliance, Deceived, and Reven releases on the 15th of this month. Deceived is a must read imo. It gives a lot of backstory on Malgus. Those all tie in with the TOR games.
For books, go with Fatal Alliance, Deceived and Revan as they really help set up the game. If you haven't already, I'd also go play Star Wars: Knights of the Old Republic and Knights of the Old Republic II: The Sith Lords.