Slayergnome:Is there a way I can make my model follow a terrain model if the terrain model is an .fbx file.
The short answer:
No, at least not directly.
The longer answer
Do you want to make an object that moves "freely" around moving up and down as the terrain does or do you mean you want an object to follow a specific path? .If it's the former look into collision detection, the later well you could use collision detection in theory, its easer to use path movement.