It is becoming more difficult to enter teaching from the business sector in part due to No Child Left Behind. In New Jersey, there is the "alternate route" method of becoming certified, but just this year the rules have changed, so while some schools in the past have been reluctant to hire alternate route candidates, the likelihood of these candidates getting jobs will only decline in years to come. Of course, it depends on the state in which you live. I would contact a local state college or university and see what classes you need. Just be forewarned, you will probably need to invest multiple years, considering student teaching in itself is one semester. There will also be Praxis exams that you will have to take. In NJ, if you want to teach a subject in high school, you need to take only one test; however, my husband, who went to school in Pennsylvania, had to take 7 or 8 Praxis tests.