Hi Amanda!
Here is a great tool where you can look up attractions by park and by age of interest.
Park Attractions
A few attractions that you might want to avoid even if your little ones meet the height requirement:
Magic Kingdom- Haunted Mansion and Pirates of the Caribbean, both rides are dark and have scary moments that may be too much for young ones.
Epcot- Maelstrom, which is in the Norway Pavilion of World Showcase, really scares my daughter so we avoid that one.
Disney Studios- My three year old loves Voyage of The Little Mermaid, but Ursula is a little scary and it is a little loud. The Great Movie Ride doesn't have a height requirement, but does include scenes from movies like Alien and Indiana Jones so you might want to skip this one.
Animal Kingdom-the only attraction that might be too much for your little ones is "It's Tough to be a Bug," there are parts that are dark, loud and spiders that might make an appearance.
Please don't hesitate to ask any other questions you may have, have a magical first trip!