Hi, Though I've been numerous times to Disneyland in California, I've yet to make it to Disney World. My boss, however, has gone twice & his family's trip itinerary is filled with lots of tips & info.
I made it into an Editor's Choice trip (Disney World in 5 days - Great Family Vacation) because they hit all the major spots like Magic Kingdom, Epcot, MGM, Future World & more. Their trip itinerary even includes the Downtown Disney Marketplace where you don't have to pay an entry fee & is a great stop for your last day.
They stayed at the Walt Disney World Dolphin but if that's too steep for your budget, just save the trip as your own, & add one to your liking.
I can feel your excitement! Have a great time!