Congratulations man! Some short tips.
- have a coach that understand you are young enough to take responsibilities and take you seriously.
- who you want really reach? No b*****t target market, define it! .
-test the market with some free tools/webside or crowdfunding campaign first.

CREATE MOMENTUM, continue feedbacking your BM and get feedback from all the people. I was selling newspaper at 14 years old. none were taking me seriously so i went to some old guys, made them selling my papers and payed per commission. I made more money at the end :)