Hi, Crystal! We brought our first child for his first time to Walt Disney World when he was two years old. His eyes wide with wonder and our hearts overflowing, it was one of the most magical trips we've ever taken. I think you'll have a similar experience with your young princess.
In terms of advising you on packages, I would start by
comparing Vacation Packages. With your daughter being under the age of three, she won't cost you anything in terms of tickets or dining, but I'm not sure what your budget will allow and how many other adults are traveling with you. There's really a price range for every family. You can enjoy staying on property either in the Value, Moderate or Deluxe categories -- basically, you pay more for staying in accommodations more convenient to the parks and having more options such as dining, recreation and activity choices. You pick the category that's just right for you and your family. Plus, traveling during "off seasons" will make your vacation budget go farther.
Then, based on when you're there and how long you're staying, you can choose Magic Your Way Passes to suit your needs for visiting the parks. For instance, I always advise friends and families to only purchase tickets for non-traveling days. Reserve those partial days for places and activities like Downtown Disney, The Boardwalk or Fort Wilderness. Also, if you visit during the most popular times of the year, you would benefit by adding the park hopper option, and if you're coming during the warmest months, you'll definitely want to try out the water parks.
I hope I've helped point you in the right direction. Once you have an idea of more travel details, come back and ask more questions! We're here to help. Have a wonderful day and a magical vacation!