Your state doesn't require a teaching certificate to teach EMS? I would start with creating the course outline, curriculum, and then a lesson plan for each class. I would always have a binder per class and a tab for each class with the lesson plan and any materials I would need already ready to go.
The course outline should include the chapters covered and organized so you can be sure to cover all essential material in the time given. The curriculum is what the students get a copy of and should include your expectations for what they need to know by the end of the class, and should have your contact information incase they need to miss a class or arrive late.
The lesson plans should have an objective for each contact meeting. What you hope to teach them in that lesson and how you are going to do it. This is where I would make notes about a certain call I had run that was relevant. Be careful to not rely too much on past scenarios though.
As Anthony said, run through each lesson plan. Teaching is probably 75% prep work and only 25% actually teaching.
Good luck and remember to stay confident