I never found professional organizations very helpful. Basically, your competition will not get you more work. Usually the cost of membership is not worth the benefits. What I do find helpful is attending, in this cas, Realtor Association meetings, Classes put on by the board of realtors, and other realtor events. This is where you will get more business and get to be known by the people you want to do business with. Check out what events are being put on by a broker or the board of realtors and attend and rub shoulders with your clients.