Select a container for the burl. Find one that has a slightly larger diameter than the redwood burl. The container should be at least 2 inches deep and able to hold water.
Set the burl in the container so the bottom of the burl is in the water. Keep water in the container at all times.
Watch the redwood sprouts come out of the top of the burl. In time, you may see roots growing from the bottom of the burl.
Plant any trees that actually sprout in a location where they receive plenty of moisture. If no roots develop, prune the shoots growing from the burl with a cutting instrument. Shape the miniature forest to suit your tastes.