You are both as experienced at the art of teaching and entertaining on air as you are at making cooking understandable and fun through your writings. A large percentage of StarChefs readers are professional chefs as well as culinary students as well as people considering the possibility of becoming food professionals. Remember that it's a visual medium and you have to visualize what you're doing as you're doing it. It's teaching on television and there shouldn't be too much talking, just enough. Of course you need visuals to go with the verbal part.
Television is for seeing and hearing.
I think being lively and enthusiastic is important. You can't be dull and pedantic. TV is a marvelous teaching medium because you have both the visual and audio together. Definitely know your subject inside out. Enjoy it and love your work.