Legends of Old Mars is a Edgar Rice Burroughs’ Barsoom variant of Games Workshop’s Lord of the Rings / Legends of the Old West game. I think that system is perfect for playing games involving John Carter, Tars Tarkas and the other denizens of Burrough’s Barsoom.
Even if you don’t like the science fiction game, Warhammer turns out to be a pretty flexible system for playing other periods. Plus, it has the advantage of familiar mechanics and a built-in player base. So given that, its not surprising that it’s been extended to practically every period you can think of. Here’s a variant of Warhmamer 40K for colonial games in darkest Africa.
We recently dug out our old Epic figures for a game and had a lot of fun. Lots of figures are still available on Ebay and you can get the Epic Armaggedon rules at the link: Epic Armageddon Rules and Army Lists
I stopped buying Warhammer 40K stuff when they dropped the squats as a major race. In my basement workshop, I’ve got a horde of the stunties, in regular battle gear, on trikes, in exo-armor … you name it. You can find an online squat codex in the War Vault.
Games Workshop offers a free pdf of its Warhammer 40K battle primer, which contains basic for moving, shooting, fighting, using psychic powers and morale, along with other material to get you started.