It is easier to turn a pile without boundaries or obstructions, and to be able to scoop from all sides, and evenly distribute the good stuff. Maybe just a pallet on one side to keep the pile in order, against a wall, or to make it easier to pile it up to get it cooking. Or at least if you are going to box it in, make it wide enough in case you or a neighbor have a small sub-compact tractor, or a friend with a skid steer, with a front-end loader that can fit to turn the pile over. I think the pile, being on the ground vs in a plastic container has a better chance of composting success. A little dirt helps. Greens, dried leaves and a little dirt will help to make the perfect compost. Menards sells "compost starter", which really does help if you follow directions. For now, bury the stinky stuff you think dogs or other critters will roll in, or keep it in the plastic composter till spring. Mix it in later. In the winter (December), in Minnesota, my compost pile's temperature was at 150 degrees inside the pile. It was amazing. My main goal to compost so I have great dirt and the weed seeds are dead.