If you are considering teaching, take any opportunity you can to get into the classroom to see how other teachers do things and handle situations before you have your own class. Ask questions of veteran teachers to make sure you are making the right choice for you. Make sure you love working with kids and want to work hard to make them successful.
When you start your first job, remember you can learn so much from experienced teachers. I suggest you find a mentor at your school. Many schools will assign you a mentor as a first-year teacher, but if you aren't given one, then try to find someone in your subject area.
They are great to help you get adjusted, show you where to find materials, and can answer your questions along the way. Finally, go to as many school events as you can outside the regular classroom to show your students you care about them and help them celebrate their achievements. I am the sponsor for the Student Council, the National Junior Honor Society, and the Fellowship of Christian Athletes for the middle school.