I am sorry to be a wet blanket,but you won't be able to work in New York (or for that matter anywhere in the US).
To work in the US you need a work permit,what is known as a Green Card.
To obtain one of these you have to be entered in the Green Card Lottery.
Sadly the US excludes UK citizens from the Green Card Lottery (for whatever reason).
It USED to be possible to get a job with a US company first,and that would (possibly) allow you to obtain a Green Card.
Unfortunately,due to the US position in the world financial reccession President Obama has closed that loophole.
Other ABer's MAY be able to suggest other routes,but I feel that above is the present (and longt erm) situation.
I wish you luck looking for permission to work in the US,you will need it!