Hello Claudia and welcome to the Disney Parks Moms Panel!
I cannot wait for you to experience a new year's celebration at the
Most Magical Place on Earth. It will be a very busy time at the Parks but with a bit of planning, you can map out a relaxing evening. Advance Dining Reservations will be crucial for a busy day like New Year's Eve. You can book a meal as early as 180 days in advance, which happens to be July 4th.
I encourage you to book a location
within Magic Kingdom, as the park has the potential of closing for the evening due to reaching full crowd capacity (if you leave, you may not be allowed re-entry). Consider Liberty Tree Tavern, Tony's Town Square or Cinderella's Royal Table in Cinderella Castle! Perhaps your li'l Mouseketeer would enjoy character dining at the Crystal Palace! Any table reservations will be highly sought after so timing will be of the essence to book on July 4th or soon after.
You can book a reservation
online starting at 6:00 a.m. EST or by calling 407-WDW-DINE, 407-939-3463 beginning at 7:00 a.m. EST.
What other questions do you have, Claudia? I'm happy to help.