A lot of people tend to think that you need some special photographic reflector. The fact is you don't and often a simple piece of paper will do the trick to get proper fill for your image.
What You Will Need:
White Paper (The thicker the better)
For this you simply use the paper as close to the subject as desired to create flattering fill light. You are simply bouncing light to either lessen or eliminate shadow from your subject. Remember light fall off is exponential. By paying close attention to your subject you will be able to observe the effect that is being created.