A good podcaster's interview follows the same principles as a good journalist's interview.
Asking relevant questions to draw out your source
Listen to their answers and remember that you are first and foremost in a conversation!
Practice your interviewing skills a bit before conducting your first major interview. Then, research your guests -- their interests, specialties, etc. Develop a few questions that you want to learn from them, but don't worry about staying "on script." Let the conversation develop. Unless you are podcasting live, don't worry about time -- you can edit it once the interview is finished. Get the story first. You can always cut it, but it is sometimes hard to go back and get another interview!
Some good sites online to help:
Interviewing Principles (from Columbia University. It's long, but useful!)
How Journalists Can Become Better Interviewers (from Poynter)
Much of the content that you find on the internet belongs to someone else. Not only is copying it morally wrong, but it can land you in legal trouble as well. Therefore, follow some basic rules.
Some useful sites:
When we teach this class, it is helpful to use a single software editor, but there are many out there. Some are free, but most have a "pro" version that gives you more flexibility.
We use (and teach) the free version of:
but you can also use: