Where are you flying out of?

When I was in your shoes, I went over to the local community college where this guy had been teaching private pilot ground school for years. Turns out, no CFI had ever come in a pushed flight training. I got three students out of 10 in the class. Or, maybe you could find a school that would let YOU teach a PPL ground class as a non-credit course.

Have a nice business card made up and make some flyers you can post at unaligned FBO's, airport cafes, college campuses, workout clubs, Safeways, ect...

Craigslist. Maybe even Ebay.

As much as I hate sales, I'd love to take a crack at selling GA flight instruction. I just don't want to do all the flight training. You're not around Spokane, are you?