Are you a photographer starting out? You can't afford to hire an assistant for your shoots, especially if the shoots are unpaid? Well, you have one of two choices for using a bounce board:
Choice 1: ask your client to hold the bounce board. Although its not very professional, it's an easy way to do a shoot with a client without having to pay someone to help you. The primary problem is that your client might be annoyed that they have to hold the board, and they also might be impeded a bit. Just tell them that is the price they have to pay since they are getting headshots for such a low rate.
Choice 2: you can set up a bounce board system. Go to a photography store and purchase a lighting stand, a reflector, a reflector boom attachment, and a sand bag. It should run you about $125. What you need to do is to set up the bounce board so that it reflects without you needing to have an assistant to hold it up.
The key to using a bounce board is to know how to light up the face of the client without it seeming fake. Light coming from below will look terribly fake and won't show off the client in a flattering way. Instead, always have the bounce light coming from the side. It looks more realistic and will make the photo look much nicer.
After you use a single bounce board system for a while, you may want to look into a multi-bounce board system, where you use two boards to reflect light in a more flattering way, coming in from both sides of the client's face. The result is gorgeous and can really make your photos pop.