You will have so much fun! Staying at the resort is definitely the way to go and Coronado Springs is nice.We stayed in Port Orleans. My favorite aspect was the transportation system....so easy. Ditto on getting the book. Go to your favorite book store and look through the books on Disney...there are lots of them. Make it an afternoon.;-)
Epcot is really cool but watch out for the 3-D shows. We went to "Honey I Shrunk the Kids".....Quick summary. Rats come running at you. I was trying to be so smart, so I closed my eyes. Had no idea that there were air hoses at your feet that made it feel as if rats were running on your legs.

I quickly jerk my legs off the floor, and thrust them forward, hitting a child in the back of the head. I am certain that child talked about "those special effects" after the show. At the end of the show, the dog sneezes and you get sprayed with water simulating dog crud on you. Everything else was just awesome.
Realize you are at a tourist destination and go with the flow. I am so excited for you. We also enjoyed the bike trails, nice and flat.