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Dig around online. There is a fair bit of info both on cartridge conversion, to make the stuff, and on reloading.
IIRC Starline makes brass.
I don't think it's been produced for about 60 years or so. Could be wrong, but most of what I read around the weeb, is that if you want to shoot your .41lc, you better learn to load.
Yep, you'll have to load your own. Mike Venturino has a chapter on loading for the 41 Colt in his book Shooting Six Guns of the Old West. An excellent book with lots of photos and reloading data for lots of old sixguns.