+18 only please. It's illegal for anyone underage to partake in these activities

But as a girl in my mid twenties, I've met a few other girls here and there who sell pictures/videos online (but I forgot to ask my questions!). I never imagined I would do something like this, but I'm already taking pics for my sweetie, so I wouldn't mind making a little side cash. What are safe ways to do this? How do you even get started? How can I do it and stay anonymous?