Hi Julanne,
You must be so excited about taking your first trip to Walt Disney World!
My family are big fans of character meals and always do several during our stays. They provide a great opportunity to spend time with the characters without having to wait in line at the parks.
You can get a good idea of what characters will be present at each character meal by selecting each individual restaurant on the Walt Disney World website and clicking on 'Make a Reservation' This page provides details of what characters may be present during your meal. (Please note however that characters are always subject to change)
For example, if you click
HERE you will see the information for 1900 Park Fare.
If Alice in Wonderland, Cinderella and Jasmine are must-sees then i think that you have made great choices! You will be greeted by Cinderella as you enter the castle for your meal at Cinderella's Royal Table and have a good chance of seeing Jasmine either here or whilst at Akershus Royal Banquet Hall. 1900 Park Fare is without doubt your best bet for seeing Alice in Wonderland.
Wishing you a magical trip!