Fruit trees are a wonderful way to grow food with little effort in your yard. With a little care they can produce large harvests for decades.
The only real work I put into my fruit trees is a little pruning. Pruning will help keep the tree healthy preventing damage and maximizing the yields. In my opinion it also improves how the tree looks in my yard.
My general philosophy is to prune on an ongoing basis. I hope to avoid large prunes all at once.

How to Prune Fruit Bearing Trees
https://youtu.be/YEl_fBVA1PE?list=PL5mfR-r4BXH2zbHVmcbp8if3JJf25D7jt

Fruit Tree Grafting for Beginners:
https://www.youtube.com/playlist?list=PL5mfR-r4BXH2zbHVmcbp8if3JJf25D7jt