how to enable FPS look

hi

i am working on a walk-trough 3D scene in T3D. I have created an empty room, and i started loading 3d objects-houses,trees,rocks..., so now i have to rescale the objects to be real life size proportion. I dont know how much i have to rescale the objects because when ever i run the game, the camera is in free look mode and can fly everywhere. Can someone point out the method how to enable the fps look, that camera can not fly everywhere.

thnx