See: Millerism, The Great Disappointment, Adventism.
Anyway, if you got NV from Steam that would be the easiest way to get the DLC.
First movie is the Thrawn books. The second movie is Anderson's Jedi Academy books. The third is a ten hour spectacular of the Vong invasion.
Lucas has this habit of enthusiastically approving stories, and then forgetting what he's approved and messing it all up.
Which is why most of the best Star Wars EU authors have jumped ship.