LauraRN,
So glad to hear that you are making the change to office nursing. I have worked in family practice, but am currently a health educator/in corporate wellness. Anyway, I found that office nursing is what you make it. Take the initiative, find out what your MD will allow you to do, make him aware of what you know and can do on your own. The pace can be very busy, lots of phone interruptions, etc..........but it is very rewarding to watch your patients make progress, grow up, and they enjoy having a steady person to whom they can turn in health crises.
As far as organizations, there is the American Association of Office Nurses: Website is
http://www.aaon.org
They also publish "Office Nurse" periodically (can't remember how often) in "RN" magazine.
Any other questions, feel free to e-mail me, and best of luck in your new career path!