You don't mention the scale you are working in, so I'll assume ho. Kevin gave an excellent suggestion. Do a small tool shed, maybe a garage to gowith a house kit or r-t-r you have. I would just add, for a tar papaer roof, you can use 400 grit wet or dry sand paper. I would also suggest you look through "Robin At His Best" in The Academy here on the Gauge. The structures he built are a lot more complicated than you will want to start with; but if you find yourself wondering, "How do I do this window?" or someother thing slows you down, you will probably find that Robin addressed it in one or more of the models he built using old cereal boxes.