There are many sites for ideas, suggestions and tools to help you create the best possible Interview.  Below are just a few suggestions.

Memory Kit Guide: How to Conduct an Interview (English)

 https://www.youtube.com/watch?v=_4pm_-GGyUw

Tell Me Your Story - Interviewing Tips for Kids

https://www.youtube.com/watch?v=SWRYIAfojqk

https://www.youtube.com/watch?v=6NG-XCwuWfk

https://www.youtube.com/watch?v=pFjmocEZASo

https://www.bing.com/videos/search?q=teaching+kids+how+towrite+interview+questions&&view=detail&mid=F9A16F8CBFF8A30E2203F9A16F8CBFF8A30E2203&&FORM=VRDGAR

Interview Websites:

https://www.businessesgrow.com/2017/05/25/podcast-interview/

https://blog.spreaker.com/2015/09/21/podcasting-tips-how-to-conduct-an-awesome-podcast-interview/

https://www.copyblogger.com/better-podcast-interviews/