Agree on http://realestateu.tv/sponsoring-brokers/ which offers good choices of sponsoring brokers in NYC to pick from. That is how I found Mont Sky Real Estate.
I've had a great experience with them even though I joined with no experienced. I've quickly closed on a sale listing I worked on directly with the Principal Broker within 2 months. Great, real world training and a commission check much sooner than I expected. Thank you Mont Sky!