Hi!
You'll have an amazing time!! So excited for you, I love Orlando and the theme parks!!
Check out www.thedibb.com for all the great things that you wouldn't find and has all the park info and everything.
If you've got a cheap pram I'd take it as if you need great if you don't then you can just leave it where you are staying. The big shows such as Fantasmic (Hollywood Studios - AMAZING) don't start till 9pm ish and you need to be there about 90mins before to get seats together and after when you've got loads of people leaving at the same time after 10pm then walking miles accross a huge car park - as the trams they have can mean you wait till midnight before you've left the car park! The big Magic Kingdom fireworks start at 8pm and Epcot starts at 9pm. Full show and parade times are on the The Dibb website.
They do stroller hire but its $10 per day plus despoist. The Dibb has all that info.
I couldn't find it when I was there last but as there is 5 of you and I've heard good reviews about an ice cream sundae called the Kitchen Sick it costs about $23 but is huge and contains every flavour ice cream and topping they do.
Its from a restaurant with an american diner theme called Beaches and Cream which is located on the Disney Beach club hotel complex. You can get disney transport there.
www.thedibb.co.uk/forums/showthread.php?t=155053
You must complete the ESTA otherwise you won't be allowed to board the flight!!
esta.cbp.dhs.gov/esta/esta.html
When you are there pick up all the coupons books etc as you may find that you use quite a few if you aren't just dining at Disney.
(Also you get alot of kids eat free coupons)
I recommend Downtown Disney's Rainforest Cafe, go off peak we had a late lunch at 3pm and we had great service, great food and kids love the atmosphere of being in the rainforest. (Well I do!) www.rainforestcafe.com/
Pondarosa is great for breakfast very cheap all you can eat breakfast buffet which has most things for an american breakfast, (best to avoid on sundays as all the americans seem to go out and you'll have to queue and wait) jello in about 30 colours, popcorn chicken, salad, pancakes, sausages, eggs, waffles, biscuits (like scones), ice cream and much more.
www.ponderosaorlando.com/pages/Menu-06.html
My one must go to restaurant is Bahama Breeze, it was the best meal of the holiday for my group! Check out the website www.bahamabreeze.com/menus/
Have fun