I don't know of any comprehensive guides out there. It's not a real commonly-kept fish, so any guide would just be a collection of anecdotes in any case. I've tried raising juveniles (power outage wiped 'em out after a few weeks) so my experience is pretty limited, but I've read a good bit about them. The basics:
Tank size- at least 6' X 2' footprint, preferably wider. They get big!
Substrate- unimportant
pH, KH, GH- unimportant
Temperature- unimportant
Current- low
Aeration- unimportant
Feeding- fish, crayfish, nightcrawlers, frozen seafood, beef heart; not sure if they're pellet trainable
Tankmates- other big tough fish
Other- lots of cover, secure lid, enough space between water and lid for air gulping