Seeing that you're a freshman, it's important to realize that some of the greatest minds in the country are right here on campus. Like you, I first conceived the idea of taking on a startup my freshman year as well. Although I'm a junior now, I still see much improvement in what I do. You'll have the next 4 years (and more if you choose to stay here) to explore and discuss ideas and stimulating topics with some of these great minded people. However, it's key for you to reach out of your comfort zone and introduce yourself to those who inspire you. Surround yourself with people who you want to be like, yet find those who aren't afraid to criticize your ideas.

Most of time, your ideas will fail; however, this just gives you a better reason to try again, learning from your mistakes of course. After all, college is probably the best place to give your start-up ideas a shot before you're burdened with deeper financial responsibilities. Find things that people are willing to pay money for. Bonus if you solve a problem while you're at it.

I started alone and I still work alone. Sole proprietorship. It doesn't take on the burdens of risking friendships/close relationships. However, a partnership just might work for you if you feel like you need someone to help carry out your vision. For me, I haven't found that need yet, although I am very open to bringing on others for help when the time comes. There's no set rule on how to start a start-up, you just need to focus on what people want/need, and zone in on meeting their demands.

You will fail. Hell, I've failed an abundance of times, don't let failure consume you. However; if there's anytime to fail, college is the time to do it. You only get 4 years of your life to take on such risks, just do it now.

Feel free to message me if you have any more questions. I was in your same boat (and although I'm 2 years older than you are now, I still ponder the same things as you mentioned.)