I was a bike Ed instructor for 6 years, mainly working with kids 9-12, now I coordinate the programs so I don't teach as much, but let me know if you have any more specific questions. Happy to help.
I highly suggest you bring props also--your bike, helmet, lights, pannier/basket, rain/snow gear.
Couple other things I thought of: don't assume all the kids know how to ride or have a bike. I always mention that my students are 7-75, so the ones who don't know yet don't feel bad about it. & If you know local resources for free/low cost bikes for kids, bring that info to leave with the teacher.
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I highly suggest you bring props also--your bike, helmet, lights, pannier/basket, rain/snow gear.
Way past time to cook dinner!!!