Matthea runs a radio station in Minneapolis, USA, staffed mostly with untrained but enthusiastic volunteers. She wants to know how to teach them about interviewing on air.
I don't know of any places where you can find this stuff online, but the basic answer to your question (for all types of media) is be prepared!
That means: know the history of the interviewee, know the background of the topic for discussion, know the current events surrounding both and how they come together. in other words... research!
Next, ask yourself some questions to work out your angle. Why am I interviewing this person? What does my audience want to know from this person? Is there an over-riding topic that must be covered?
Then work out some good, meaty questions that don't have yes/no answers (eg "Where did you get your inspiration for...?" or "How does... affect you?"); dig for the interviewee's thoughts and feelings rather than facts and figures that a press kit might include. Hopefully you'll only use a few of these questions because the answers will spawn new trains of thought to pursue by themselves. Whenever a subject is talked to death you can always go back to your list.
A good way to practice is to pick some famous people and work everything out. What would you ask if you were interviewing Monica Lewinsky? Or Bill Clinton? Or Hillary Or Chelsea? Apart from the obvious sex thing, what about "How has this has changed your life?" or "Who is to blame?"
Of course, not every interviewee will be so notorious, so how do you interview someone from the local theatre group? Once you get past the name of the play and what it's about some questions might be "Why are you doing this sort of play today?", "What relevance does it have for people living at the dawn of the 21st century?", "What sort of person would want to come and see the play?", "Does community theatre have any relevance when so many people can't even find work to pay for a ticket?", "Should the taxpayer be funding the arts?" (the USA had a right wing scandal over funding "smut" under the guise of art - see Dirty pictures).
Other than that, it's just like having a conversation with someone you haven't seen for a long time. Catch up on the gossip, find out about things and people you have in common, find the human being behind the public persona.
Minneapolis should have some kind of technical or journalism school who could give you advice about books to read (there are books on everything these days), too. Good luck!
You are a sweetheart! Thanks so much! The information you gave me was a wonderful start!
I am going to go to the library this weekend to see if there are any books on interviewing. But even if I don't find the books, I already have homework that will make my interview much better thanks to you!
Thanks again,
Matthea