Will you have the dining plan? Are you there 5 full days & 6 nights or 4 full days & 5 nights? What time are you arriving? What time are you leaving?
I'd decide, first, what parks you're going to be at on what days & then decide your meals from there. Will you have parkhopper tickets?
W/ 5 year old girls & for 1st time visits, I'd be looking at the following:
MK Day - Crystal Palace for breakfast, lunch, or dinner. We also like CRT - but don't know if you want to use 2 TS credits if you have the DP.
MK Resort Area - Chef Mickey's for breakfast at the Contemporary, 1900 Park Fare at the Grand Floridian for either breakfast (characters - Pooh, Mary Poppins, Tigger, Mad Hatter, etc.) or dinner (characters - Cinderella, Prince Charming, & Stepmother & Stepsisters), 'Ohana at the Poly for either breakfast (character w/ Stitch & Mickey) or dinner (all you can eat "family-style" w/ festive, fun atmosphere), or Whispering Canyon Cafe at the Wilderness Lodge for dinner.
EPCOT, Future World - Garden Grill for dinner (characters - Mickey, Pluto, Chip & Dale) or Coral Reef for lunch or dinner
EPCOT, World Showcase - Norway Princess Breakfast, Chefs de France (Remy comes around & plate & "visits" the tables) or San Angel Inn (for the atmosphere) or Teppan Edo
EPCOT Resort Area - Cape May Character Breakfast at the Beach Club
Disney Studios - Hollywood & Vine Character Breakfast, Sci-Fi for lunch or dinner, Mama Melrose for lunch or dinner for the Fantasmic Package
Animal Kingdom - Tusker House Character Breakfast, Yak and Yeti for lunch or dinner
Animal Kingdom Lodge - Boma for dinner
If I had the basic DP w/ 2 5 year old girls, my "plan" would probably look like this (depending on your arrival & departure):
Arrival Night - CRT for dinner - pay OOP
MK, 1st Full Day - breakfast (snack, resort), lunch - Crystal Palace, dinner - Columbia Harbor House (counter-service)
EPCOT, 2nd Full Day - breakfast - Akershus, lunch - Sunshine Seasons (counter), dinner - World Showcase Counter
Disney Studios, 3rd Full Day - breakfast (snack, resort), lunch - Toy Story Pizza Planet, dinner - Mama Melrose's (Fantasmic Dinner Package)
Animal Kingdom, 4th Full Day - breakfast - Tusker House, lunch - Flame Tree, dinner - Pizzafari or Boma at the AKL (& pay OOP for Tusker House)
MK, 2nd Full Day - breakfast (snack, resort), lunch - Cosmic Ray's, dinner - Ohana at the Poly
Departure Day - Chef Mickey's for breakfast, lunch - Earl of Sandwich at DTD
Regardless of what you decide, I'd definitely make ADRs for a princess meal, a Mickey meal, & the Crystal Palace (w/ Pooh & Friends) meal.
Check out the menus & have fun planning!! (One of my favorite parts of our
Disney vacations is planning our meals!)