Here's a couple of ideas for you.
1.) Start with a story board of ideas. Nothing fancy stick figures will do. Just outline the basic idea from start to finish as the camera would see the shot. This will help communicate to the cameraman what your vision for the project is.
2.) Rehearse once or twice with him so he can see the effect your performing, and be ready to anticipate your movements so to keep you in frame. Also gives him a chance to set up the shots so all the action is in frame.
3.) Give him special directions if you want to make sure certain things are caught on film. IE: When the spectator selects a card, go in close and make sure you see on camera what the card is, then pull back to a wide shot of me and the spectator. etc.
4.) Film a test run first before doing anything for a live audience and review the video with your camera man. Give him notes if needed on things that can be done to capture your vision for the project.
5.) Have fun!