Here are some good sites to check out:
http://fly.hiwaay.net/~jlspence/faq_fw.htm
http://allears.net/index.html
http://touringplans.com/
The first is a FAQ on FW. It has a ton of good info. The second is Deb Willis' site. It is a wonderful site for planning, right down to the menus at the restaurants.
The third is the most important. If this is your first trip to Disney World the thing you must understand is that it is not like any amusement park you have ever been to, or ever will again. DW is 45 square miles of pure entertainment with so many options and attractions that you could come back for years and have a different experience each time.
However, to get the most out of the trip you need to plan your trip. I have seen too many people walking into the parks, grab a map, then start looking around confused as to where to start. If you end up as one of them it is pretty much guaranteed that you will become frustrated and not get as much out of the trip as you would like.
The way around this is to pick up The Unofficial Guide by Bob Sehlinger and Len Testa. It will help you develop a road map and tour plans that will greatly enhance your visit, especially if you only have 4 days. The book and the website will be immensely helpful in ensuring that you and your family have a great time.
A word of caution; don't assume you have a lot of time. For instance, if you have little ones and want to try come character meals, especially at Cinderella's Castle, you need to make reservations as soon as they are available, which is generally 6 months out.
Most of all, enjoy! Planning the trip is 1/2 the fun!