I've never formally taught archery or hunting, just casual stuff at the range and on the tailgate, but I have taught other subjects as a TA. You DO need some structure.

I would not let your entire presentation rest on Q and A. Have an outline with the basics only, as others have suggested.
Keep the presentation cursory. It's just WAY too easy to gooble up time relating even a few personal experiences. Save them for your Q and A and the end.

In addition to safety, I think you may want to include just a few blurbs on arrow shot placement and some bloodtrailing hints, like how long to wait before persuing, and spraying Hydrogen peroxide to pick up blood. Definitely do the Q and A, but leave it until the end. You may even want to ask them to hold their questions until then to insure you cover everything on your list.

Nothing major, just cover the safety stuff for sure, and touch on a few other topics to make them aware that they need to know more before going afield.

You'll do fine. It's just like BS'ing with your hunting buddies.
Even if you could present everything you know, they'll never absorb it anyway.
Just remember, they are there because they WANT to learn.
The'll pick up what they need most, and they'll learn the rest the hard way, like the rest of us.