Probably the most important way you can help your camera is by feeding it the right film. You must control it with your choice of film speed, since you can't control exposure when you snap the photo. Use ASA 200 film for macro shots, pictures of small rooms and walls about 15 feet away, ASA 400 film will extend your range to about 20 feet. If most of the features you will photograph are large or darkly colored, choose a faster film. If you plan to focus on closer, smaller details consider shooting with ASA 100 or 64 film.
Slower films have smaller grain and produce sharper images.