How tf do i start???

Okay, so im 16f and in a crazy difficult situation. To put it simply, my parents pulled me from school when i was really young, they've isolated me, and won't let me get a job. I've been secretly applying to places, but it hasn't been going well.

I do digital art, and really enjoy it! I do drawings of singers, movies, shows, games etc. And i like to draw tattoo designs. I would really like to sell them as digital pieces and do commissions, but I genuinly have no idea how lol.

I would appreciate any and all tips on how to get started, how to do it, how to set stuff up, how it works, and if there's some way to keep it from my parents lol. Thank you in advance!