Drill 1/8 to 1/4 inch holes around upper bucket walls for cross ventilation, and several in the bottom for drainage and migration. Keep holes small to block pests, and back them with mesh where needed. Smooth burrs so worms are not harmed.
Hydrate shredded cardboard, coco coir, and leaves until they feel like a wrung-out sponge, then fluff for airflow. Add Eisenia fetida and a small starter feed of chopped produce. Bury food, avoid salty or oily scraps, and let microbes precondition the buffet.
Nest a perforated bucket inside a solid catch bucket, or stack multiple perforated buckets so worms migrate upward toward fresh bedding and food. When lower layers finish, lift and empty castings. Sift gently, return stragglers, and store moisture-balanced castings in breathable containers.