I do not know where in MS you are, but I do know a few fellow studio owners in that state and I would advise that you put together a few examples and then call for a appointment.
Most of the folks I know, if they are looking for a retoucher, are looking for someone who can basicaly do zits, blend in tan lines, stray hairs, color/contrast and other what I would call "light" work like that. And don't forget that all of us studio owners are going to want that work back before we give it to you
But do be aware that a good many of us do this kind of stuff in house, and many of us would rather have an employee (even a part time one) do this rather than send stuff out.
Good luck!
Mike