Snagy. First of all one of the things you need is a book on Perspective Drawing I bought mine many years ago
Second Model Rail Road Magazine printed by Kalmabach K Books here is a list of what I have
1. How to Build Dioramas by Sheperd Pain
2. Detailing Tips and Techniques No 35
3. The Art of the Diorama By Ray Anderson he was a great friend
4. Realistic Model Railroad 3rd Edition By Dave Frary
5. A very old Military Modelling special Stan Catchpol's Modelling Workshop
What you want to do is build the back lot like MGM Fox, Universal
most of them are facades. Another thing is use what you have at hand
The Local Hardware Store has a gold mine of stuff for hobby building. Last is the miniatures page History section lots of War Game buildings great for Ideas. I would Create my own and go on You Tube there are two webs that are really great
Willie