Welcome to the DIS!
You should be able to pick up a transportation guide at or near the front desk when you check in. It will show you all the bus routes to get around in the world, and as I recall give suggestions on getting from place to place. Any resort to any park or DTD is a one-bus ride, it gets tricky to go from resort to resort.
The Monorail only connects the Magic Kingdom and Epcot. And yes, within the parks walking is the only mode of transportation (although at the MK you can use the train to go from one area to others; though walking is usually faster!)
Have a great trip!