The rub or "dry brine" is salt, sugar, and pink curing salt (sodium nitrate). Mix the salt and sugar at a ratio of 2 parts salt to 1 part sugar. Then add pink salt in the amount of 10% of that total weight.
That's the basic cure. Then you can add other spices, like black pepper & bay leaves, maybe red pepper or garlic. You can also add brown sugar with maple syrup or bourbon (or both, I guess).
http://thejewelofthemidwest.com/2015/08/13/bacon-part-1/
http://thejewelofthemidwest.com/2015/09/03/bacon-part-2/
We have a store that carries pork belly, usually cut in 1-2 pound pieces. To get a bigger piece, you have to call ahead and ask them to cut it for you when they get their delivery.