here are some pics of sanding and firing metal clay.
Be careful it is very fragile.
Set the clay on a heatable tile or something fireproof surface. Turn the light off, important to see when you stop firing. Light the torch, point it towards to the clay about 3/4" from the work. While holding the flame, move the torch slowly around in circular motion. Heating it until it starts to glow red. Continue heating til it becomes a bright and luminous color. Hold this color for 2 minutes, if it starts to bubble pull the flame away. It means you are too close. When the time is up, turn off the flame and allow the clay to cool.