Hi Christie,
Character meals are so much fun!
Some of the menus are available to view on the Walt Disney World website and you can find them by following these steps:-
1/ Click on "Where to Eat" on the home page
2/ Click on "Character Dining"
3/ Click on each individual Character meal
Where menus are available, you can find them on the left hand side of the Overview page like these
sample menus for Akershus Royal Banquet Hall.
Another great source for finding menus for almost all of the restaurants at Walt Disney World is the unofficial website www.Allears.net.
I would definitely recommend Chef Mickey's, Donald's Dining Safari Breakfast or Lunch & The Crystal Palace if you children are picky eaters as these are all buffet restaurants which offer a large selection of different foods.
Wishing you a magical trip filled with memories which will last a lifetime!