Hi Christine!
You could probably fill an entire library with all of the different Walt Disney World planning books available today. I have a little obsession with purchasing planning books and my favorites are:
The Unofficial Guide to Walt Disney World by Bob Sehlinger and Len Testa,
The Complete Idiot's Guide to Walt Disney World by Doug Ingersoll, and
PassPorter's Walt Disney World. There are specific kid's editions of the Unofficial Guide and PassPorter books if you'll be travelling with little ones.
I also find the DisneyFoodBlog.com e-books very helpful when it comes to planning Disney dining, especially if you're visiting during the
Epcot International Food and Wine Festival or using the Disney Dining Plan. For some fun trivia both before you leave and once you're in Walt Disney World Resort, I highly recommend
Hidden Mickeys: A Field Guide to Walt Disney World's Best Kept Secrets by Steve Barrett. You'll love searching all of the parks and resorts for hundreds of "hidden Mickeys."
I hope these recommendations help fill up your library, Christine. I happen to think reading Walt Disney World planning books is a great way to spend my time by the pool over the summer. Please let me know if you have any other questions at all.
Have a magical day,
Ashley