Everyone first coming into a classroom will be nervous. Just know the course your teaching and the textbook you will be using. Making sure you are well prepared for class, will make your day run smoothly and you will feel more at ease.
Ninh,
It is OK to be nervous but it will get better as you gain more confidence in your ability to deliver your content. As you say you know your content and you have the experience to share the content. It is just the matter of getting comfortable in your delivery. I would work on getting some ice breakers to start the classes off so you have a chance to get settled into the course. When you share a laugh with your students it releases a lot of tension and helps you to settle your nervous. The humor can be a saying, a joke, an observation or something you experienced in your field. Anything to break the ice and get the class started.
Gary
Gary Meers, Ed.D.
