First time at WDW - congratulations
OK - here is a 4 day plan - please add extra days & budget as you wish
arrival - MK - see the castle, enjoy. go on some rides - catch a quick bite to eat at Cosmic Rays - or make an ADR for the Plaza Restauarant.
If you are staying in the MK area - go to GF 1900 Park Fair (ADR) for a nice character buffet dinner. If you are at an EPCOT resort, try BC Cape May clam bake (way more than clams)- Or eat somewhere at your resort for dinner.
Sleep
Day 1 - eat breakfast in your room Go to EPCOT - do some rides , enjoy lunch in Canada - Le Cellier (ADR) or Coral Reef (ADR), Young kids -get a kids passport and visit all the countries in the World (check out the kid stops). Go back to your resort. Enjoy the pool. Eat dinner a the snack bar type of place at your resort (you had a big lunch)
Day 2 - eat breakfast in your room, Go to AK - ride safari, see the Lion King, enjoy the animals - eat lunch at Tusker House (or Rain Forest Cafe (ADR)- join the Rainforest Cafe club - Landry's) - leave AK by 2:30 PM, go to resort to swim, Dinner - Polynesian 'Ohana character meal (ADR) -see fire works from Poly beach.
Day 3 - sleep in, eat breakfast in your room, swim in the AM, lunch at resort, Go to MGM Studio's by 1:30 PM, do the rides youe like, - ADR for Fantasmic - eat at Hollywood and Vine for dinner - get Fantasmic package - see Fantasmic in the evening- crowds - do not worry - check out the shops- buses/boats run till 1 hour after the park closes.
Day 4 - sleep a bit late, eat breakfast in the room - go to MK by 9:30 AM - avoid the turnstyle rush - another character meal - see Pooh- have lunch at CP (ADR) - nice buffet - do many MK rides. go back to your resort by 4pm - do a quick swim. LAST DAY ? - Please include dinner at CR Chef Mickeys's (ADR) to see the big cheese and his gang
Day 5 - eat breakfast in room, say good by to WDW, till the next adventure.
More days ? Park Hopper Pass or A/P ?
Please try HDD - make ADR's up to 180 days in advance (used to be 2 years)
Do more EPCOT and AK and MK
Spend more time at the pool at your resort
Play mini golf
Rent a boat or bikes
Shop and 'play' in DTD
All the above depends on your budget, type of tickets, number of days and where you are staying. Moderates and Deluxe resorts have refrigerators in the room. The shops normal carry milk, oj....bring your own cereal, pop tarts, garnola bars.