You are going to be a guest on a podcast and the host has a great audience which will give you great exposure! What do you want the audience to know about you? If you were able to talk with them individually, what would you want them to know about your business? Don't leave it up the host to figure out what you should say, create a list of questions for the host and post them on your website along with a great introduction blurb so you leave nothing to chance. You should also include a promo for the interview that will attract attention for potential clients. Make it easy for your host to have you a their guest!