NYC! I think you are the first person I've seen over the years. I'm not surprised at all to read you are challenged to find the resources to get started. Honestly, that area of the country NYC area/NJ/Connecticut is remarkably underrepresented which I think is very interesting.
Anyhow, do you have much space? All materials needed can be ordered and you've come to the right place. There are guys from all over the country that can help you and I'd get a major kick out of seeing an Osage self bow representing the NYC!
I recommend people start with a good stave. Too many have the logic of "I don't want to ruin it" but I say...garbage in = garbage out.
Let me know if I can help answer questions regarding materials, your starting point, etc., please feel free to PM me. I lived in NYC for awhile in the 90's and appreciate your pursuit.
Stephen Parnell
P.s. Good luck, hope you enjoy the ride...be warned, it can be highly addictive!