Hi Dana!
The fireworks at Walt Disney World are spectacular! You are definitely in for a treat.
Both Epcot and the Magic Kingdom have fireworks displays almost every night. You can see them from some of the resorts, but your best views are in the parks.
Epcot has the show,
IllumiNations: Reflections of Earth. It's a beautiful mixture of music, lasers, lights, and fireworks. You will find a calendar with times on that link. It's almost always at 9 p.m. It's an amazingly moving show.
At the Magic Kingdom, you can see the
Wishes Nighttime Spectacular. I love this show for so many reasons! The biggest being that it features some of the classic Disney music and characters that I grew up with. My biggest challenge with this show is not crying like a baby throughout! On that link, you will find a calendar with times for this show, as well.
I hope this helps! Please let me know if you have any other questions.