[Little32]

I have taught at many different levels over the past few years, elementary, highschool, and post secondary. Currently, I teach at a college. I agree with Redefined on some points. This is a different breed of student, and they do things that you and I would never have done in the classroom. The work is demanding and so draining, and it is very rare that you will receive any sort of positive feedback from the students that you are working with (not that it does not happen, but it is rare). However, it is not as bleak as it seems.
One piece of advice that I can offer is to make sure that it is the work in itself that fulfills you. Don't expect the students you teach to make the job worthwhile. If you are looking from some sort of validation from your students, you probably will be very disappointed.
It might be helpful if you tell us what grades you are thinking about teaching. Different grade levels present different challenges, though there is some advice that is useful across the board.
I will post more later.