Sometimes districts have programs for people like you. I know of one at a district in Maryland--people interested in a career change study for a year towards their certificate and then become a teacher. Usually teaching requires that you have your masters (takes about a year), you have to take the proxis exam, and then submit the paper work for a certificate. The best thing to do is look at school districts on the web to see if they have a program for you (or your local university might have some help for you). A lot of people make career changes into teaching, so good luck!