advice

Pascal Campion on drawing.

https://goo.gl/T7XOK3

Watch this to find out if fan art sales are legal.

There's also a good essay 'Are fan fiction and fan art legal?' on io9.com.

Do not give away your art for free.

He mentioned something creating your own projects, self publishing online (via blogs, online forums). That is a proven concept. There are countless examples, some of them on the Art Blogs of Note list. Draw daily and your passion will get you there.