I admit it...I LOVE books...for first timers, I would suggest the following:
Birnbaum's guide to Disneyland, 2006 (because it coupons in the back valid only for 2006, and lots of great info.!)
The Unofficial guide, becuase it give good and accurated information on rides, including scariness factors, which is a must if you have small kiddos (de-rail...on our last trip I started talking with a family who's youngest, about 7, was in tears. Evidently they choose Indiana Jones for their first ride...can you say OOOPSSS!) They also have the prefab schedules, but I'd look into Ridemax.com (can I say that here?)
Los Angeles and Disneyland for Dummies has some great info, especially if you plan on stepping foot outside DL resort.
I think Disneyland and Beyond is worth mentioning. It has great line buster games in it, as well as a slightly different slant. I don't know if they have printed an updated version, though.
I'd try the library for all of these; then choose one or two to purchase *unless you're like me and want a small collection of Disney (and other) books*.