For Black York, I would suggest White Gold as a pollinator. It’s self-fertile, a good pollinator of other cherries and is one of the better choices for Eastern states. A good alternate is Black Gold which is also self fertile.
Do you know anything about growing fruit or cherries in general? Cherries require more maintenance than say apples. In most cases you will have to spray to control brown rot and insects. I would suggest you look at this thread on growing cherries in Eastern conditions where we have summer rainfall and humid conditions.
For sweet cherries to pollinate you need two things- the pollen to be compatible and the bloom times of both trees to overlap. Here is a chart that shows bloom times and pollen compatibilty.