Well you will be right at the end of the snow-bird season down here. And that means campgrounds tend to be full. A lot depends on the weather up north tho, mild weather will tend to pull the snow-birds back north. Ft Wilderness is certainly the prime location for Disney. It is expensive and from what I hear somewhat tight packed. It does have transport to the Disney Parks tho. You need to go online and check availability for your time slot.
Other than that there are many CG in Florida, no surprise. but again you'll have to find places with open slots. RVParkreview.com is your friend here. And also reserveamerica.com.