A few of these, a few firebricks, an anvil (or piece of rail) and a four-pound hammer, you can start your own blacksmith business.
There is, of course, more to it than that. Try googling on "propane forge" and you'll get lots of hits about all kinds of setups, from ridiculously cheap to full bore smithies. I know for a fact you can make your own burners out of common plumbing components. A lot of custom knifemakers have built their own forges using little more than info found online.
Here's a few links that might help:
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-chib