how can i teach in ny with a bachelors degree?

go to http://www.nysed.gov/ It will show you all the requirements to teach in New York.

You cannot teach in the public arena (or at many private schools) unless you have gone through a teacher certification course at a university. There are quite a few teaching based classes that are part of any teaching course. Following that you would have your student teaching and for New York, probably also have to take the Praxis test, a test to prove your general knowledge. I would check with the New York Department of Education to look for more specifics regarding certification and licensure.