All base classes, feats and talents from these books are usable in the campaign. Prestige classes are also allowed, but talk it over with the group first.
The only players truly need for the campaign is the Star Wars: Saga Edition Core Rulebook, which contains the core rules for running the game. Please note: We are using the official errata for the game.
Rules, feats, items, and talents from these books are usable with approval from the group.