A lot depends on where you teach. Do you have a statewide CNA educators conference? I learned a lot from that and from my Train the Trainer class. Are there other instructors or is there a CNA coordinator that can help you along?
I have been teaching high school health Occ CNA classes for 4 years. Our class is from 7:30 AM until 9:15 AM. We usually go to the lab to get them moving and waking up, practicing skills first, and then go back to the classroom.
Get the book called "what the best college teachers do" and another book called " "Teaching Strategies for Nurse Educators."
DeYoung, S. (2015). Teaching Strategies for Nurse Educators (3rd). Pearson Education, Inc.: Upper Saddle River, N.J.
I use a variety of activities in the classroom to keep them moving and participating. We also have workbooks that they get extra points for completing.
On your very first day of class, lay down the law. What is expected of them. The door is locked at 5 minutes after class begins and you are absent for the day for example. Attitudes, figure out what is non-negotiable. Cell phones are non negotiable for me, they are rude, and the faculty complain about rudeness of the nursing faculty on their phones, so I do not allow cell phones in class. Anything you can think of that you can hit head on before the problem occurs.