You might not hit a home run with your first business...

When I was about 10 or 11 I started my first business.  It was not wildly successful and it did not make me thousands of dollars in profit, however it did teach me a few things.  As well it was the start of a life long journey to entrepreneurship.
My "business" was selling sandwiches and snacks I made in my parents kitchen to my brothers friends who seemed to be always hungry!  Keep in mind this was in the late 60's early 70's so you can use your imagination.  They would buy most anything, they were always hungry!  Wink Wink, nudge, nudge.
This "business" only lasted a few months, but I learned a few things, the problem was at the time I did not understand what I was learning.  So even though I was learning about finding a customer who wanted or needed what you sold, sales strategy, marketing, ROI and keeping a low overhead, I did learn some lessons that are still valid today.
So your first entry into a business or an artistic venture might be a little more organised and professional than my first venture it is still your first move and you can't grow or evolve until you take that first step.
After all if my first venture was selling sandwiches to hippies when I was 10, your first move is sure to have more going for it than that.  Right?

Thanks to South Park for image!