You're going to make lots of mistakes. I had mentoring from the guy who owned the grocery store. He was a retailer. He gave me tips on pricing and markups. And if things really do take off, adult supervision will be necessary.
Teens know most about their own interests and tastes.
There are a lot of things in their world they know more about than adults do. You'll also get more respect if you don't overreach. As for naysayers, keep in mind that you'll run into them whatever you do, your whole life. The best response is not to argue and just move forward, Dunlap says. Let your success speak for itself.