The Cambridge English Dictionary defines an interview as: “A meeting in which someone asks you questions to see if you are suitable for a job or course.”
Deciding whom you want to interview, depends on the purpose and subject of the interview. Keep in mind who your target audience is and whom they are likely to listen to/connect with.
Research as rigorously as you can. Start Googling both (issue + interviewee) and reading. Be it on the Internet, in the newspaper or books, see what others your candidate may have already said.
Form a couple of introductory questions, some which are more challenging or “grilling” in nature, and a couple of tangential ones.
Make sure to record the interview with the interviewee’s consent. After the interview is over, listen to it and type it out, line-by-line and word-by-word.
Make sure that the interview is flowing smoothly. Each question and answer that comes next, ought to be connected to the previous ones, and not disjointed.
Now that you know everything about how to write an interview based blog, what are you waiting for? Wear your interviewer’s hat and ask those tough questions!