Ooooooooooooo you have set off my exite-ometer big time with your questions.
Haven't been to Florida since 2001 but did lot of Disney/Universal research for that trip.
Have only seen your message as I'm signing off for the night, and unfortunately have work in the morning, but I'll get lots of info for you.
For starts I'd recommend International Drive for a first visit, that way you can do Disney or Universal plus all the great places to eat and drink and shop around "I Drive". But I see you've already booked a villa, chances are it's nearer Disney than I Drive. DONT WORRY! YOU WILL HAVE A GREAT TIME WHEREVER YOU STAY! (Sorry for shouting! - but really, it's not like Dublin traffic!)
Give me some specific questions and I'll try to find out answers for you. When we went in 2001 it was a bit of a risk buying park tickets online but I checked out where we were buying from and we saved hundreds!
If you want to buy a book to help, the first one I would recommend is "A Brit's Guide to Orlando" by Simon Veness and regularly updated. Top notch advice.
Any space fans should make space for a trip to Kennedy Space Center.
Really, I have piles of links for Florida holidays, if you want to have them, let me know.
-- And if you can't fill your suitcases, I'll go on a diet and make sure you don't take off on empty!! --