I would like to do some temporary airbrush tattooing at some of the high school football and basketball games but I can't find a good stencil. How do I go about creating a self-adhesive stencil for doing temporary tattoos or what can I use to adhere a plastic type stencil to someone's arm or body area so I can effectively use the stencil to paint with.

Please try Tattoo Stencils - Google Search

There are also adhesive sprays that you can get at most hardware stores that will not adhere to a surface permanently.