New York is one of the largest metropolis on the world. Plenty of citizens with different roots, descendants of immigrants from different ages of history. There are hundreds of various pubs, artistic places, whole Broadway avenue is stuffed with music halls.
This town is always awake, even in the middle of the night you might hear the voices of the ambulances. You could find there many of stores with all kind of
services, like tattoo studios, shoemaker, watchmakers. For those, who wish to get a large format printing NYC has plenty of stores.
Digital printing shops are now one of those, which are always stuffed with customers. Somebody like to get his Bachelor Thesis printed, other one need to scan some photographs. when you are thinking about run store like that on your neighborhood, you are not risking a lot. Just localize any rent control building, without any digital printing around, and start your business.
You will must to put up in few hardware, like printer and scanner, but you might take a loan for it in local bank. Then, try to arrange your interior in modern, stylish way, people need to see that you are the best in your trade. Then, you have to think about any commercial. Maybe article in local paper, or some hoarding nearby? If you want to gain money, you need to spend it first.