I agree on the make your meals where you're going to be. I always tell people who ask me . . .
Generally, busses run from your resort to theme parks or Downtown Disney. There are no resort to resort busses.
Here is some more information that may confuse you or help, it's up to you. I'm sure someone will correct me if I'm wrong.
At the front entrance of Disney-MGM Studios, off to the left as you exit, you can get a boat to Epcot (and vice versa) that makes 3 stops on the way at
Swan & Dolphin
Yacht & Beach
Boardwalk.
At Epcot, the boat drops you at the International Gateway between United Kingdom and France.
At the Magic Kingdom, you can get a boat to these resorts
Polynesian
Grand Floridian
Contemporary
Wilderness Lodge & Fort Wilderness
Monorails:
The Resort Monorail loop has the following stops
Transportation & Ticket center
Polynesian
Grand Floridian
Magic Kingdom
Contemporary
The Express Monorail runs between Magic Kingdom and Transportation & Ticket center.
The Epcot Monorail runs between the Transportation & Ticket and Epcot's front entrance.
Check out
http://www.ourlaughingplace.com/asp/twiz.asp
That might help, too, to familiarize yourself, or to use to get specific routes you might be thinking of. Any specific questions, let me know.