What is the best way to start your own business and what are good business ideas for a teenager?

I am a teenager and I am thinking about starting a business for the first time. I would like to start up my business with very little money and I would also like my business to involve my community. I’ve had a few ideas but all of them were already created and well established so now I am asking for your thoughts and ideas. Mainly what I am looking for is general topics and things I could do at very little cost and ones that I wouldn’t have to sacrifice my grades to establish and maintain it. An ideal business for me would be one that allows me to have creative license and work on my own time. The most I would like to work on my business would be a couple of hours each week.
P.S.
I also would appreciate it if you talk about your own stories of entrepreneurship if you have any to share. :) Thanks