I am wondering the same thing. I was watching to see if anyone with any actual experience would come back. Here are some links I found:
There are quite a few sites online. Many universities have web pages dedicated to the how-to's of preserving produce.
Historical note: every year the Germans would have what was called Der Latwerg which was the annual vat cooking of pear butter. It was an opportunity to eat and drink up all the wares from the previous year (rosy noses to follow), come together as a community, and for the younger folks go "a'courtin."
I hope you'll find that your apple trees are older and neglected trees as opposed to wild ones. Apples that are grown from seeds (wild) are nearly always very bitter and almost non-eddible. Before the modern techniqes of grafting were discovered and widely used (late 1800s) apples were primarily only used for making "hard cider". The one in a thousand eddible-apple trees were treasured and protected as a god-send. So if you do have a truely wild apple, you should consider Hard Cider since it is unlikely the apples will be good for anything else!