Hello, Tara!
Your first visit to Walt Disney World, with two little princes in tow is so exciting!
You'll love Disney's All Star Movies Resort. I had the opportunity to see the resort this past March, and was so impressed! Your boys will love it.
Regarding parks, Walt Disney World has something for every age at every park, so you really can't go wrong in any of them. Take a look at this special page for folks
traveling with little ones at Disney Theme Parks. There, you'll find information that's geared to Guests with little Guests in tow; it's a great source of tips!
Now, regarding heat, let me know when you'll be traveling to Walt Disney World, and I'll give you some strategies based on when you'll be staying. In general, though, be sure to head to the parks as early as possible, so that you can head back to Disney's All Star Movies for a nap and / or a swim when the sun is at its hottest.
Let me know if you'll be on a Dining Plan as well, so that I can include restaurants in my suggestions for you. In general, it's best to plan your meals so that you'll never be too many hours in the heat of a hot summer day. Air conditioning and ice cream can really change a person's mood...and that's just the parents!
Send more questions as you think of them, too, Tara! I'd love to help you plan your first visit to Walt Disney World!