Hi - I do work at home but I am a medical transcriptionist. I took classes at a community college, then worked for a company in their office for a few months of training, then started working at home. There are pros and cons to working at home, just like there are pros and cons to working anywhere else.
I agree with the above posters that most of these work-at-home ads are scams. I also feel that most of the mail-order training programs, like the one for medical transcriptionists, are also scams and wouldn't go that route.
Best wishes!