Flash Bounce Reflector
A good way to light a scene with a single-flash unit is to bounce the flash. You may want very soft light to lessen the tonal range between highlights and shadows and to soften any background shadows. If you bounce or reflect the flash off of a light-colored surface you can get soft light. You are basically changing the narrow spot of flash light into a wide area of diffused light. Avoid colored walls and ceilings if you are using color film.
You should use a bounce reflector for the best control in using bounce flash. These are large reflectors that are designed for bounce lighting. They are specially made reflectors that are lightweight, compact and portable. The best bounce reflector for close up shots is about 3 by 4 feet square. A six by six foot reflector is good for full length photos. There are also some types of bounce reflectors that fit over your flash unit. These units redirect the light at an angle from the flash and then usually soften the light by passing it through a diffuser. You will have to practice using reflectors until you are used to them. Bounce reflectors start at about $20.