AETHERPHON, global theremin family

I have just joined your group because of my interest in the theremin.  Actually my nineteen year old son is pushing for this, but I'm interested as well.  I joined because I wanted to get some education on this.  My son is interested in learning to play a theremin.  I wanted to know what was the best way to start (teachers, etc) and where the best instrument was.  
I'd be interested in whatever any one has to contribute. We saw a movie on the theremin several years ago and my son and I have not forgotten it.  He keeps asking me how he can do this, so your help will be appreciated.
Thank you.
Merrie