For an experienced word processor, it is possible to learn medical transcription while working in an entry-level position, but it is rare because of the need to learn medical vocabulary and formats. Some colleges and hospitals offer classes, and there are several home-study courses available. MT's work in doctor's office, clinics, hospitals and transcription services. They also work from home, usually after 2-3 years of experience in an office or hospital. With more experience, MT's go on to teach, supervise, consult, edit and write in the field.
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Newsgroup, sci.med.transcription - not a web site. Please read it.