Personally I prefer to use just the anal glands. And like Mr Jameson stated cut / grind them fresh before aging them as they will ferment and break down a lot faster and save you from having to grind them when their odor is really loud. Place the cut glands in a clean sterilized jar and leave enough head room for expansion, place in a warm place out of direct sunlight. I place the species labeled jars of glands to be aged and rotted down in a small apartment sized refrigerator that I rigged with a digital thermostat to control a 60-watt shielded light bulb inside which keeps a constant temperature at or near 80 degrees. (An idea I got from Russ Carman's book)
To put up glands fresh I start out by placing a couple ounces of concentrated urine of that species into a clean sterilized quart jar with about a 1/4 teaspoon of zinc valerate and shake it well. I cut the glands into pieces with a razor blade knife and add them to the jar of concentrated urine / zinc valerate solution. As the jar fills with glands, I will add more urine as needed. I can later grind or process further as needed.
I use the same process for fox, coyote, fisher, and bobcat and process the glands right from the carcass throughout the trapping season. It is my opinion that glands that have NOT been frozen produces a better odor and end product as I believe freezing kills some of the beneficial microbes and bacteria within the gland and shorts them of their full potential and true odor.