ok first and foremost, remember to breathe... you have picked one of the most expansive resort entertainment complexes in the world for vacation at the height of the season.
Some planning guides are a good start... The official Burnbaums Guide, the unofficial guide, and allearsnet.com are great starting points for gathering info. wdwinfo.com has many planning tips. but if you google on touring plans you will find a site that has great info on which parks are busiest on which days, and ways to plan around the crowds.
Dinning reservations... make them as soon as you have an idea of where you will be on what days. Be flexable, resies tend to go quick because the dinning plan is attractive to many cutomers.
For Character Breakfasts I would recomend:
Breakfastasouras; Chef Mickey; Crystal Palace and depending on the age of your kids Playhouse for toddlers, The princess breakfast at Epcot for little ladies.
for lunch, think counter service... easier, more flexable, and can fit in with most plans.
For dinner, think about the major attractions you will trying to attend and plan for dinner in plenty of time to get to them... for instance, a 7:30p at Liberty Tree Tavern will have you done eating at just about the right time to walk out front and catch the 9:00p spectromagic parade. Or Mamma Melrose at about 7:00p for Fantasmic!
you can go with out reservations at all, but will be hard pressed to get seated at a table service resturant.