Enroll In A Teachers College If You Want To Be A Good Teacher
Personally, teachers should have formal schooling when it comes to teaching their students. That is why there are specialized college for teachers. Teachers College teaches their students how to become good and effective teachers. And they teach their students the most recent teaching methods.
One of my friends were able to go to a Teachers College and their on the job training was to handle and teach students in high school a particular subject. I do not know how you will choose your subject but you will have subject to teach assigned to you. I remember him telling me that he had fun while teaching.