You must be a full time resident of New York State in order to apply for a New York State Pistol License. You must be a full time resident of the county (or major city) through which you apply for the license.
Under what conditions you do business is irrelevant if you live out of state. There is no reciprocity between New York State and any other state. There are no provisions to transport a handgun into and around New York State if you are not licensed (except law enforcement).
There is a very limited exemption for shooting team coaches, you do not fall into that category.