Ill be leaving WDW the day you are arriving. My suggestions:
-Look into a Disney Guide Book, I personally like the Unofficial Guide because they have Tour Plans that you as a Disney novice will be quite helpful in helping you plan your day.
-Do not miss any of the park's night shows (Wishes and Spectromagic at the MK, Illuminations at Epcot, Fantasmic! at DHS) some of them (Spectro, Fantasmic!) do not happen every day, plan your days so that you see them at least once. My family's rule is that we never have a night on the property where we do not see one of them.
-Stay on property, it truely makes the vacation feel special, it feels like you leave the "real world." Also a park is open for ERT (or as Disney calls it EMH, extra magic hours) one hour in the morning and three hours at night every day.
-You are there during the Flower and Garden Festival at Epcot, be sure to check that out
-Just to give you an idea, here is our schedule:
-Day 1: Arrival day, check in and spend the afternoon/evening at DHS which is showing Fantasmic that night.
-Day 2: Blizzard Beach in the morning/Magic Kingdom in the afternoon-evening (Spectro is running that night, Evening EMH)
-Day 3: Animal Kingdom in the morning (EMH,) Typhoon Lagoon in the afternoon, and the Magic Kingdom in the evening (we will likely simply see Spectro and Wishes and not even ride any ride as we have a reservation at Ohana before this)
-Day 4: Epcot all day (morning EMH)
-Day 5: DHS all day (Fantasmic showing)
-Day 6: Magic Kingdom all day(morning EMH, Spectro showing)
-Day 7: Epcot all day (evening EMH)