Finishes include copper and cast iron, as well as clay. A whole is cut out of their round bottom portions, through which you view the fire and add fuel. Also, they feature a short chimney that directs the smoke up and away from you and your guests.
Position it a safe distance from anything combustible, and remember the smoke will rise through the chimney, so be aware what is above it. After you have it positioned, it is important to insulate the bowl so the fire is not directly against the surface. Add sand or pea stone to the bowl until it is about 4 inches below the lower lip of the mouth. Next, place two bricks on their side about 6 inches apart. The bricks will keep the wood elevated.
The first fire you set should be small in order to season the material. You can burn any type of wood normally burned in an indoor fireplace.
If you won't use it during the cold winter months, it's best to store it in your garage or shed.
Wikipedia - Chiminea