Hi Megan,
Thanks for your question! Walt Disney World includes 4 theme parks:
Magic Kingdom,
Epcot,
Hollywood Studios and
Animal Kingdom. When purchasing your tickets, the most economical option is to buy a multi-day ticket. The price-per-day drops significantly after you get a 4 day ticket. If you buy a "Base Ticket" you can visit one of those 4 theme parks per day. If you add on the "Park Hopper" Option, you enjoy same-day access to all 4 theme parks, meaning you can "hop" around from park to park. Since you have never been to Disney, a Base Ticket would be perfect for you & you can thoroughly explore each park.
There are also 2 water parks:
Blizzard Beach and
Typhoon Lagoon. You can either purchase tickets separately for those or buy the "Water Park Fun & More" add-on to your ticket which will allow you unlimited access to the water parks for the same amount of days as your regular theme park ticket.
I don't have further information for you about any non-Disney theme park. My family has always immersed ourselves in Walt Disney World and we've had so much fun there, we've never had the desire to leave property.
Hope this answers your question about the
Disney tickets.
Please let me know if I can assist you further in having a wonderful vacation,
Kaylene