When I was in business school, they had a different programs for legal, medical and general secretary.  I took the legal courses.  All they were really were learning legal office procedures, terminology and special shorthand for the terminology.  The medical field worked the same way.  

This might be something you could do on weekends, but I wouldn't try to do it at night.  You already have enough at home to handle right now.  If you already have some knowledge of medical terminology, if may be worth looking into.  For my part, I learned more legalese from actual experience than from the classes I took.  However, medicine is quite different.  So many of the illnesses and symptoms sound and are spelled similar that you have to really know your stuff to avoid a mistake.  

As with any other company, investigate it before you make a committment.  I'm sure some of these are legit, but just as many could be a scam.

Michelle