I used to teach 4H, and the best I can offer is to ask someone to take notes for you in case of questions you want to answer later, techniques you might want to demonstrate, and use the first fifteen minutes of class as everyone gets seated to answer any questions from yesterday or last class. Also playing soft music quietly, as they learn, helps keep the more volatile among the students from getting too frustrated. Letting the students help each other with questions is also a way to foster community among the students, as long as you are there to moderate the answer to assure accuracy. Good luck you are in for a wonderful experience. I learned more from them than they did from me. (In fact it was one of my kids that showed me the best way to line up snaps so you have them spaced right. Rub some water over the bump part of the snap after it is attached, then press it against the other side which leaves a dot for you to line up with. Brilliant!)