Hannah,
You should think of points that you want to get across. My last experience was delicate because I was doing a secular program on Trinity Broadcasting and they were supersensitive about promoting your business, That should should not be a problem for you.
Arrive early and talk with the interviewer. If he's good, he will ask you some advance questions to get a sense of how to drive the interview. And just let him drive. Lastly be aware of time. I can share my program with you (they gave me a DVD) and you can see how quickly I wrapped up my whole talk in 30 seconds.
David

