Whenever possible, use a simple background and look for things, such as a pop can on a kitchen counter or a tree limb that looks as if it's growing out of a head, that will distract from the subject. Although it's fine to center your subject in the viewfinder, sometimes placing a subject off-center can make a composition more dynamic and interesting to the eye. Use the right type of film. Take advantage of good lighting. Some people might be surprised to know that cloudy, overcast days provide the best light when photographing people outdoors.
Bright sunlight makes people squint and throws off shadows.
Take good care of your camera and film. It's a good idea to buy a single-use camera to take the beach. Don't let film pass through the X-ray machines at the airport. However, you may be surprised to learn the biggest threat to film is heat. In fact, it's a good idea to keep your film in the refrigerator before and after use.