Hi there Amy!
Welcome to the Disney Parks Moms Panel. I'm so excited you are beginning to plan your trip to the Most Magical Place on Earth. You can
purchase theme park tickets for the Walt Disney World Resort online for 1-10 days in duration with the option of One Park Per Day or Park Hopper Tickets. The 1-day tickets are the only tickets where price varies based on the date. Once you are on the ticket page, select a 1-day ticket and then select the day on the calendar in which you will be visiting. You will see that there are three separate price tiers for 1-day tickets: Value, Regular, and Peak. After you select which day you will be visiting the parks, you can choose a ticket for one park or a 1-day ticket with Park Hopper option. This ticket allows you to freely visit any of the four magnificent theme parks on Walt Disney World Resort property throughout the day. If you are able to extend your trip, you will see that the per-day pricing decreases when you purchase multi-day tickets of longer duration.
Before your trip, make sure you are familiar with the various methods of complimentary
transportation between theme parks to make your day more efficient. For example, Magic Kingdom Park and Epcot are connected via monorail and Disney's Hollywood Studios and Epcot are connected via boat. There are also buses that can take you between parks. My toddler son has just as much fun riding these various modes of transportation around the Resort as he does many of the attractions! Take time to appreciate that magic lies all around you when on Walt Disney World Resort property and not only at the theme parks.
I hope this helps, and please feel free to stop by and visit us again. Have a Zip-a-Dee-Doo-Dah day!
-Jennifer