I think that's a great question and that's excellent to see you already preparing for your college experience. Here are my 3 pieces of advice for you:
1) College is a lot of fun, but the main purpose is to learn and do well in classes. Focus on getting adjusted to college life, being away from home, meeting new people, etc. Everyone adjusts differently and you want to give yourself time to feel comfortable with your classes and university life in general.
2) I strongly suggest joining at least one club or organization your Freshman year and maybe one more each additional year. This is a great way to meet people and make friends, explore the campus and community, and have unique experiences that many other students won't get (and you can add it to your #resume. I was involved in many groups in college and met some amazing people that way. I waited until a few months in to Freshman year before I joined because I wanted to focus on classes and getting adjusted first.
3) If you want to do an internship, I would suggest talking with your #career Services Department, Academic Advisors, and Professors (or members of any student organizations you have joined) and they will be able to provide you with good insight in to opportunities. I would begin researching Sophomore year and waiting until Junior or even Senior year to do an internship.
I loved college and was very thankful for being involved in many different groups.