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First rule of thumb for preparing for an interview? Have some basic knowledge of the subject you will be covering! This is easily done by getting a little background information from other print media such as books, magazines, documents, etc. (Planning ahead will also allow you to be able to carry on an *intelligent* conversation with your guest.)
Once you have a general idea about your subject, prepare a list of questions you'd like to ask your interviewee; think about what information your readers would like to know. You can then use these questions as a general outline for the interview. Be flexible...you'll almost always think of more once the interview has started.