Last time I was at the art gallery I stole one of their art pieces and sold it as my own creation.
That sounds very wrong to me. Why would you do that?
Me and my family had no money.
I believe you are creative, and I believe that you can create something that's very beautiful and can be very profitable. But plagiarizing the work of others it's never right and could really end up with you in a legal trouble that you may not be able to afford and would make you lose more money than you have already earned. So since you are creative, I do suggest that you just make a painting that is of your own creation.
I'm going to sell a few for the coming sale.
If they're original pieces then that sounds great, why not emulate what you see at the art gallery instead of stealing them? You would make more money and not potentially go to prison for stealing.