business X engineering

Hi, I’m a 9th grader, I want to own a business so I plan to get into entrepreneurship as much as I can this summer where I will try to find a problem to solve in engineering (I am not sure what kind of engineering yet) I am a total beginner which means I should start early. all in all, I’ll appreciate some suggestions, a piece of advice on which business model should i choose and how to start it, maybe some sources or courses to help me, and examples of problems that can be solved .