I think your class should be a lecture, 15 minutes, and you can talk a lot. Classes in primary and secondary schools are mainly interesting and meaningful. To attract students' attention, why not go to a local training class and listen to the teacher? Generally, private schools still have high requirements for teachers, because students are all customers, and it is impossible to attract students without the skills of teachers. Or you can watch the video of New Oriental Online, hoping to help you. The point is that you have to be attractive. Don't be nervous during the lecture. When you are fully prepared, you are not afraid of anything.