Teacher training is twofold: background knowledge of the history, theories, and best practices for education, and hands-on experiences in the form of short-term projects that are applied in volunteer classrooms and long-term projects that are applied in one classroom over a period of several weeks known as "student teaching."
New Teacher Training
Once a new teacher is hired into a position, most school districts appoint experienced mentor-teachers to help guide the first couple of years. Completing a mentor program is usually compulsory and extremely beneficial to new teachers who have little to no experience working as an educator. Administrative positions also often provide new administrators with experienced mentors to guide them.
Continuous Learning and Training
To take your training farther, consider adding a masters degree to your undergraduate degree, especially if your undergraduate degree is in anything other than education. You'll get the background you'll need, plus you may be paid more for having a post-graduate degree. Similarly, obtaining an administrative certificate may boosts your salary substantially, as administrative pay scales start significantly higher than certified teacher pay scales.