Re: New to the books.
You want post-RotJ or anything?
If so, I'd say go for the Jedi Academy Trilogy by Kevin J. Anderson, I Jedi by Michael A. Stackpole, The Hand of Thrawn Duology by Timothy Zahn and then the entire NJO series.
Prequel and other eras: Shatterpoint, Maze of Deception, Dark Rendezvous, Revan, Darth Plagueis and Labyrinth of Evil.
Should be a good start.