Speed up - any advise

ok well i'm using rhino to make my models, at the moment all my game does is load a scene and allow you to move the camera. the scene is supposed to be a church hall but i only did the enterance of it and a small hall. exported so it was quite details it was 84626 polygons and 47427 vertexs alot i know but there aint many tools which i can find which will allow me to create good levels easily that wont be to primitive. I've tried to use milkshape for levels but it is not good for that sort of thing. the main problem is that i dont have any good source of textures and even when i do get some i'm not very good with placing than onto levels, i think that is the main reason for me not using low poly models. I think i'm starting to blaber abit now.