IAABO has a huge board in the DC area. You can contact the secretary-treasurer by e-mail at
[email protected] (according to the latest IAABO handbook).
If it is like a lot of boards, there may be classes in October-November for new candidates. You will probably be required to pass the NFHS (Nationhal Federation of High Schools) exam, although I am not sure about that.
I suggest that you contact Mike to find out what you need to do to ref games. Good luck.