first i want to say welcome to the forum!! here is what i would do in your situation. i would put him in a tub with a large enough water dish so he can soak if he wants. fill it 1/4-1/2 way with aspen bedding and set the fridge at 65 and drop the temp 2 degrees every day until you get to 48-50 degrees. it should take about a week to get to the desired temp. then leave him in for 45-60 days. make sure to check on him 2-3 times a week opening the door to let fresh air in. a week before you want to bring him out do the same 2 degrees raising the temp to the highest setting then put him in his enclosure at room temp for a day then turn heat on. i would try feeding after 1 day of being on heat but don't get discouraged if he don't eat right away, some of mine take up to a week to eat after brumation.
i hope this helps and good luck!