There are no real right or wrong answers obviously. One thing that came to mind is to think about the classes you took. What did you like about them? What didn't you like about them?
When it comes to being in front of everyone, assume nothing. Smile, be approachable and ask questions to your audience. Will your class time allow you to spend a few minutes with each student? That could be a time to specifically address any potential "roadblocks" and tactfully share with the class, so as not to embarrass the student.
Do you have some friends that quilt? Even those that don't, you need a range. Have a girls night at your house and practice with your friends. This way you can see if you have any gaps or aren't comfortable with the flow as well as gain a feel for what you are about to embark on.
Pace yourself comfortably. While each one will have a different learning curve, be mindful of those that aren't quite getting it then and there. Will you have the time outside of class to be available to answer questions?
Even knowing in reality, you can't please everyone all the time, is your class content, style, delivery going to give your audience the feeling that it was money well spent? Any little "freebie" thing you can pass along---measuring guide lists, small glossary list, differences on needle sizes, batting, a few websites, just a little perk of something to involve them more after they leave and keep you in mind. Get their info so that you can invite them to another class you teach. Personal interest goes a long way.
All that said, I'm so excited for you! Did I overlook when you'll be starting? Please keep us posted on how it turns out! Above and beyond all else-----have fun!!!!!!!!!!!!!!!!!!