I dont know much about scenes, but this is what i know
if you have an object (lets say a man) and you want it in a place (a house). make the man, then create a new scene (Empty). In the new scene, model the place you want your item to be in. When you are happy, make a new scene (Empty again). go to the object scene and select the object. Press Ctrl-L>To Scene> scene.002 or whatever you called the third scene. Go to the place where you want the guy, and do the same thing.
This helps by making the room seprate from the guy. Its simmilar to layers, just more clearly defined.