re: Do-It-Yourself --- Chain Maille Tutorial
You can start by making the 4-in-1 pattern, then the impenetrable 6-in-1 pattern.
source: The Apprentice Armorer's Illustrated Handbook
There is even a machine that can mass-produce chain maille called a Whitting Davis Machine (expensive ~$300,000). Also the patent has run out, so anyone can do it now and make money using the same technique.
More on chain maille here.