There are the following ways on how to be a professional artist.
1.DRAW DAILY:
pratice,pratice,pratice daily,that's the mantra of great artist around the world.
2.BRING A SKETH BOOK WITH YOU EVERYWHERE:
if you always have a notebook/drawing book open up to the possibility of drawing anything.
3.DRAW FROM PICTURES OR FRAME:
This is the no 1 basics of “how to draw”.Learn from othe people art works or drawing.

https://www.theduckwebcomics.com/THE_FACELESS_DEMON/