For my kickboxing classes, I used to pull some great ideas from Janis Saffell, Cathe Friedrich, and Ilaria Montagnani. You can easily pull some good choreography ideas from youtube and create your own class. I like these instructors because they provide safe, sound, and fun choreography. If any of it is too much choreography, you can tone it down a bit by repeating small combos to make it easier to follow. Or, add simple fillers such as shuffles, jumping jacks or jump rope drills.
Teaching kickboxing is a lot of fun and I hope these suggestions help you.