In addition to the many web sites on the 'net, there are a number of good books that you can purchase. If you want something that will give you good descriptions of the rides along with many color pictures, try one of the Birnbaum's Disney World guides. I believe they have a kids version that may appeal to your daughter.
If you want to do a little more hardcore trip planning, there are better books out there (Passporter and the Unofficial Guide to WDW come to mind), but the Birnbaum's books are the "official" WDW guidebooks, and the Disney licensing gives them flashier presentation.