You're in New York right?
Websites are good. Checking out schools are good.
I would also keep my ears to the ground. Some of the best Masters don't have a school and teach out of their apartment or at the park.
These people who don't have a place shouldn't charge that much money since rent is not an issue. Many of them teach purely for the love of the art.
Additionally, while meeting the people who are going to train you. To make sure it is legit, make sure they can take hard blows to the neck and the balls with no problem. Don't ask them to do it, just ask them if they can.