Well, I am not an avid teacher. I have attended many workshops, though.
I would say, since you already have groups interested...find out what they are wanting to learn and gear your classes towards that. At least to start. Then you will get a feel for how things are working and advance your classes from those.
What I find important in a workshop is clear instructions to make the basic project, and other ideas of how it could also be useful in other applications. I like a calm, not too nervous instructor, who clearly loves what it is that they are teaching. Those workshops tend to be the most fun. I like instructors who are not expecting perfection in the completed project, especially when it is a new technique I have not attempted before. I enjoy the well organized classes the best. (ie. supply list of what to bring is well thought out in advance and very specific, available classroom supplies are plentiful. Instruction sheets are included, so in two or three weeks time (or more) I can review things and remember what to do the next time). I like classes that put several artists at the same table to work. That way if the instructor is busy, and I have a question, some other people around me can also help out. And it is just more fun to have crafters around to joke with, too.
Hope this helps. It sounds like you have the right enthusiasm going. After a few workshops you will get a feel for what works best for you. Just relax and enjoy yourself, and everyone else will be at ease and enjoy things, too. Good Luck!