Kids are enthusiastic. I mean living in the moment, nothing else in their mind, loving life enthusiastic. So lesson 1 is crucial...safety. In adult terms, safety is a large part of etiquette. We want to teach kids 2 things during that first lesson: farthest out throws first, and wait until everyone has had their turn before you run up to your disc and throw again. Of course, that second part isn't always how things play out, with low throws, trees, etc. But kids are used to the concept of taking turns, and it will help them learn to be aware of other players and to stay behind the thrower.