Pretty much any auto paint store can make a custom color for you.
Also, there is a spray system called Preval which consists of a can of propellant, and a refillable glass jar that you can find in most auto paint stores (and some Home Depot stores).
While you are buying the paint, take in a sample of the material you plan to paint, and ask advice. Pay particular attention to safety information. I would not recommend painting without a good respirator mask.
If you are not comfortable working with automotive paints, check with some of your local body shops. Some of them are more than willing to paint for you for a fee that can be amazingly reasonable.
If you plan to get into airbrushing, Harbor Freight has a nice airbrush for a reasonable cost if you are not dead set on getting a particular brand of airbrush.