Here is a map that may help you to orient yourself
http://www.windsorhillsvilla.co.uk/assets/imag es/orlando_disneyworld.gif
Over on the right is Orlando airport where you will probably fly in.
Over on the left (the huge pink area) is the Walt Disney complex with their various parks, hotels, and other entertainment areas.
Near the top (a smaller pink area) is the Universal Studios park (2 of them) - Universal Studios and Islands of Adventure.
Just under Universal Studios is Wet and Wild, a water based park.
And just under Wet and Wild is Sea World, a "zoo" for water based animals with some theme park rides.
The winding orange road than runs between Sea World and Wet and Wild is International drive.
Most of the hotels and restaurants are situated near the Wet and Wild park end of International drive and that is a good place to stay.
You could probably get away without having a car if you stayed there (there are buses to get you to the parks and some hotels lay of free coaches).
The area in the south east, the yellow area called Kissimee, is where a lot of visitors stay, but it is quite a drive to Walt Disney world and Universal Studios so you would almost certainly need a car.
Having an idea of the layout of the area will help you decide where to stay and help you plan your days.