If you're an old pro at medical transcription, you should have no problems finding work at home jobs.
If you're new to the field and want to train and find work, good luck. Medical transcription ads may offer to train you, but generally you're on your own to find the job of your dreams once the training is done.
Another potential issue with work at home medical transcription jobs is that newcomers may not be able to work them. Many companies prefer that those without experience perfrom at least a few months of onsite work before transitioning to a home-based position.
I don't want to burst all of your hopes and dreams, but this is the reality of the situation.
You must be certain that you will be able to find work before you invest in training courses or classes. Work at home medical transcription jobs aren't hard to find, but you do need to make sure that they're available in your area. Consider calling local doctors and hospitals to see if they need help, and if they offer home-based positions.
If you've previewed your options and your prospects look good, then go on with the training necessary for work at home medical transcription jobs. If you're not having luck finding any positions or available companies in your area, you might consider a different career path.
Now I'm not trying to talk you out of a job, just warning you that training in a field where there isn't work is a little rediculous, so you should do your research first.
If everything works out, you can make a decent living as a medical transcriptionist, so good luck.