If you get a courtyard view you will be overlooking "Andy's Room" where the statues of RC, Woody, Buzz, Little Bo Peep, and Rex are. Not all courtyard views are the same of course, but you get the general idea.
Walking time to the bus stop/food court area varies depending on what building/floor/room you're in (of course). Building 10 (Buzz) is right next to Cinema Hall, and if you're on the first floor with a room... say... in the 40's (there's 64 rooms per floor and the building is shaped like a T) there is a walkway directly to the bus stops. Literally, the closest you can be. Not to many people know it's there and they walk thru the courtyard, passed the pool, into Cinema Hall, and then out the front to the bus stops. (Much longer walk, but really not LONG).
The Toy Story section is very popular, so make sure you call the resort and have the request put on your reservation, and then remind them again when you check-in. They try hard to meet requests, but of course there are only so many rooms in Toy Story and so many people wanting them - nothing is guaranteed. If you don't get it the first day, you can request to be room changed when something does become available. But, this is worst case scenerio.
I worked there for over 2 years, I'm sure your son will love it.