Get a clean garbage can or similar container. Plastic works great because it won't rust out.
Drainage is absolutely necessary.
It also helps to drill some holes in the side about half-inch up from the bottom of the container. Fill the container with about 6 inches of good potting soil. Organic fertilizers formulated for acid loving plants such as rhododendrons also works well. Place whole seed potatoes in the soil. There should be about 5 inches between potatoes.