A few years back...
A few ideas from direct experience:
I had luck selling caricatures by renting space at the local college. People really love these and if you can draw them for less then $50 bucks a piece then you have a massive market.
Still... here's a piece of advice that applies to almost any business or any artist. Charge as much as you possibly can. You probably aren't going to make a oad of sales in art so you really need to play up the scarcity angle and charge what you're really worth.
Then when you make a sale keep in touch with the buyers any way you can. If they bought once then there's a darn good chance they'll buy again in the next two years.
The bottom line: In art you need to hustle to survive... this is why I choose a profession I love that's easier to sell to people.
But if your heart is in it you'll make it. I had some major sales before I was a professional sales writer for hire.
Was even hired to do architectural renderings for a bit... Still, the most I ever made for a painting was $565 and for a watercolour... $400. So take my advice with a grain of salt... There's plenty more experienced artists out there.
Hope this mini-rant helps.