Sorry for the late response, I hope this is still helpful for future chickens!
My husband and I regularly butcher chickens and we always save the feet and heads to use for stock. It's delicious! We also like to fry up the organs and eat them as an appetizer before the main chicken course. And one of our dogs is a fanatic for the intestines and all the parts we don't want to eat, though our other dog is completely uninterested. Maybe you have a pet who'd like it and if not, I bet there's a way to compost them.
If you're still unsure about the best way to butcher the birds, here's a video we made explaining how we do it: