You can drive in New York State with a valid driver's license from another state or country. You do not need to apply for a New York State driver's license unless you become a New York State resident.
and would you need to have an international license?
If you have a driver's license from another country, you don't need to have an International Driving Permit, but it is useful. The permit verifies in multiple languages that you have a valid driver's license. Police officers who cannot read the language of their foreign driver's license will be able to read the permit.
and what if my license was issued outside the US?