Do not overcompensate because you lack confidence. Be comfortable. Be yourself. Work from your strengths. Manage the way you do best.

Learn to enjoy your students. Generally speaking, they want to learn and they want you to succeed. Let them help you.

My lessons are best when I ask good questions and then stay out of the way while the students come to their own conclusions.

Use humor, do not take yourself to seriously, teaching is as much learning as it is teaching.

Tailor your homework assignments to your students interests, this way they are more motivated to excel.

Do not hesitate to call a parent when needed.

Finally, dedicate yourself to having a life outside of the school environment. The first year you will think this is impossible, but for your sanity and your students sanity you must do this.

A great many physics teachers I know teach physics.  Biology teachers teach biology.  And so forth.  I teach the students who are before me.  I teach people.  Always be mindful of who is in the classroom with you.  Respond to their needs.  Create lessons that will help them to become the most effective people possible.  Physics is an excellent tool to that end.  It teaches many wonderful skills and offers insight into the universe in which we find ourselves.  Just don't let the beauty of the physics distract you from the beauty of the students before you. 

Never forget to nourish your soul.  Do not try to change the whole world.  An extra project here and there is all right, but the education system has a tendency to demand more of you than you can give.  You should say no to every extra assignment your first year.  No to committees, coaching, whatever.  Just focus on being the best teacher you can.  As time goes on assume those tasks outside of the classroom only when they lead to meaningful change.  Fight the good fights some of the time.  Most of the time just let it go.

I tend to cause problems at physics teacher gatherings because they always want to show off their cute demonstrations. I ask what the kids are doing while the teacher is having so much fun in front of them?

My biggest piece of advice is "learn as much as you can about your students." I feel this is the biggest thing that separates experiences teachers from novice teachers. Find out what they think about physics, how they explain physical phenomena, why they think that way, and how they approach a problem. Find commonalities and differences in what your students think and base your instruction on such knowledge.

My second biggest piece of advice is "don't work in a vacuum." Lots of people have gone through what you are going through. Find out what they did. Copy lesson plans that work. Attend conferences. Join organizations. Search the internet.

Respect your students by not setting your expectations for them too low.

Learn what the individual knows best. Compliment it and you will find

they try harder for you. Remember, most of your students will not be very prepared for abstract material. Hold them to standards, but be honest and kind about it.

Push them every day, but don't make them feel bad for not getting something the first or 5th try.

Teach kids- not physics. When someone asks what you teach, you should respond that you teach kids about physics. Understand the difference between teaching and learning--- there may not be much connection. Work at enabling kids to learn about physics! (or Chemistry, Art, History)