I would suggest creating a portfolio of the work you've done, to show others who might be interested in using you.

If you're looking to handle a few projects here and there, then you can certainly work as a freelancer. There are many individuals who would pay you to handle their graphic art projects.

Also I would suggest advertising. I have a free classified site that you can get exposure on that allows you to upload pictures of your work. In addition, there are many classifieds online, newspapers, community bulletin boards that you can create your graphics and display them that way, without a high cost.

Finally ask your friends, and relatives to help spread the word. You never know who they may be in contact with. I'm doing some of this myself.

Hope this helps. Good luck.