I'm pursuing a major in business. What should I do now in high school to prepare?

Hello! My name is Serenity, and I am currently a junior in high school. After a lot of thought, I have decided to pursue business as a major. My intended fields to study in are Business Management and Administration, Marketing, and Entrepreneurial Studies.

I haven't confided to my parents about my decision yet, but I hope to pay for my college by myself. What are some scholarships or internships/jobs that I should apply for not only to prepare some money for college but to advance my business education?

I don't have a lot of activities I have done either. I'm currently studying for the ACT and SAT, and I did some APs, but I don't have anything outside of academics besides doing fencing for about a year. I enjoy fencing, but I had to put a pause on it because of traveling time and finances. What are some extracurricular activities that may help? How do I network with other people for more opportunities?

I apologize if this seems a bit much, but thank you for any feedback you provide!