Also, there is indeed a way to test out your interest in teaching without obtaining certification. You can teach at an independent (formerly known as "private") school. In order to credential yourself for such a position, you need to do well academically, obtain tutoring, teaching and/or summer camp experience. Also, these schools typically require faculty to coach a sport or two. So, successful experience on the playing field is a real asset. Similarly, experience in clubs and activities such as the newspaper or the chorus as well as a willingness to coach these activities is a real advantage.
Applying to these schools, in many ways, is easier than tapping the public school market, particularly if you are not too picky about location. There is a company that will market you to potential schools, located Carney Sandoe in Boston. Carney Sandoe is free to the applicant. IES charges a nominal fee. Before interviewing you should make it your imperative to obtain the school's public relations materials. Be sure to look the part. If you are a graduate of an independent school yourself that will be an advantage. Also, it might be helpful to arrange to visit an independent school and talk to people who teach in one so that you can become familiar with how they operate. You may also want to check out the National Association of Independent Schools and Teach for America. Also, many places, including New York City, hire without certification. Look into obtaining temporary certification.
Good luck.
5480 Wisconsin
Avenue, Chevy
Chase,
MD, 20815
(1/2 block from the redline, Friendship Heights Metro)