Start with what specific products you want to offer. You mentioned favors for special occasions. One source could be a local confectioner, which is more likely visible as a local chocolate company. These people are often as much artisans as they are business people, and they may already have products developed that you could sell. Check with the Candy Man .
Candy makers are another resource.
As an example, in a very small community tucked away in a mountain valley about forty miles from where I live, is a company called Kencraft. They make decorations of all kinds and a never-ending choice of candies. The point is, when you look in the Yellow Pages, Kencraft is listed as a candy manufacturer. They're located in Alpine, Utah. Now, I know that's about as far away from NYC as you can get.