I field dress ASAP. Then as far as putting on ice i will if the weather is warm but if its cold enough I like to hang the deer a couple days before de-boning. But if the weather is too warm I will debone as soon as i can and cool the meat as fast as possible. I have made a home-made cooler with dry ice and a couple blankets with a tarp. it works really well and the only real expense is the dry ice. about 8lb per day. so I would buy a 25lb piece. Its done like this. hang your deer from a rafter in your garage, cut 2 2x6 boards 10 " long. Now you attach each 2x6 on either side of the rope holding your deer. This is the shelf for the dry ice. Attach a blanket on either side of the rafter and around the 2x6's so you channel the cold air over your animal. then wrap the whold thing with a tarp. the dry ice will actually freeze the head of the deer but it will keep all the meat very very cold. I also place a small blanket on top after its all together just to keep the cold from escaping out of the top. It work very well, I had a friend who hung 6 deer with this method he has a small shed and insulated it top to bottom. a couple 15lb blocks of dry ice its almost as cold as a freezer.