I think the best thing to do Sara, is to read some TRs, a couple of guide books, and some other DIS posts, and visit the WDW website.
Up until you know what each park has for you, (as it's pretty apparent at the minute it's all still very new to you) you really cannot plan for your park days.
If I were you I'd worry less on how many parks you can fit in, and spend a while learning about what Orlando has to offer.
A couple of weeks from now you'll read these questions and realise you were jumping the gun a bit I think.
(Trust me when I say we've all been there!!)
To me at least, a successful Orlando trip isn't defined by how many of the parks you've visited, but the fun you had whilst doing it. Personally I'd rather visit half of what Orlando has to offer, and enjoy the effort put in and feel like it's been a great trip, than rush my butt off for 2 weeks, visiting all the parks, and come home knackered and not being abe to remember certain attractions, or realised I missed important things because I was rushing from A to B so fast i cmpletely missed C, D and E.