Okay sorry I guess I need to clarify.
As for professional that is what it means...They make money.
Usually like here in Dallas you will find with a little searching a club that accepts dues and fees for use of their dungeon in which you will find like minded people. Interesting and very informative to a newbie as well a a seasoned dom or sub. Check out you local papers classifieds or even better a head shop paper or any sextoy shop should have small papers or circulars pointing you in the right direction.