Don't come back into the classroom without it. As much as we will wish that motivational speakers and union meetings can make us more determined, it has to be there to start. I think trying to ease into the profession by substitute teaching or taking on other responsibilities which fulfill your desire to be in a teaching position would be your best bet. For instance, you could become a Sunday School teacher or youth group leader or something similar. But because deciding to teach as a profession is such major decision, I would advise getting as many forms of experience as possible.
Teaching takes on many forms and there are endless possibilities.