Please take a look at the NAR resources on HPR activities and certification at https://www.nar.org/high-power-rocketry-info/, and perhaps look into a couple of great books, "Make: High Power Rocketry," and "Modern High Power Rocketry 2." Both are great guides to the process of designing, building, and flying high power rockets. The second book is getting a bit old, but still has a lot of great information.

Mark