The first class is very important. I remember an experienced teacher told me that the first class impressed students deeply, so a good first class will affect your future courses. In the first class, you don't need to spend too much time on the content, let the students know about you first, and you can talk to the students about some basic information; Secondly, you know the students. What many teachers do is let students introduce themselves, or in other ways. Thirdly, I think you can put forward some requirements of your class or some requirements for them in the first section (this more or less includes the principles of your class); Finally, briefly introduce the courses you teach. The above four kinds, it is estimated that one class will pass. This is probably the flow of a class. You can adjust the time a little by yourself.

However, my deepest feeling is that in the first class, don't let the students exclude you. I hope it helps you.