1. First of all, you should have full confidence in yourself, show your ability in front of students and make them feel that you have "material".
2. Before the general teaching begins, explain to them the rules of your class, with clear rewards and punishments. Moreover, you must implement the rules you set fairly and let students know that you will keep your word. Those who violate classroom discipline should be investigated to the end to make an example for others.
3. In class, encourage more and criticize less.
4. We should also mobilize the classroom and start with interest.
It should be noted that educating students must not adopt a playful attitude. Whether you can have a good class depends on whether the students are convinced and interested.
Good luck with your work!