The circumstances are just generic "I want to teach martial arts". You're asking "what would be good to teach them". You have absolutely no direction.
You're coming off as the guy who takes a few months of an art, has an argument with the instructor and quits, and then does it a few more times, before deciding that you know better than they do, so you're going to it yourself.
Let me put it this way. If you're asking in the Beginner's Corner (a place for beginners) how to teach, you're not qualified to teach. Thinking you know more than people just because you washed out of their school doesn't make you qualified to teach.
You need to disillusion yourself of this notion if you really want to help these people. You want to teach them a culture that you don't even respect? How is that supposed to work?
This isn't about teaching anyone. This is about proving to yourself that you do actually know more than the people you despise.