Here's a quick link to the Star Mogul Rules!
The original rules! They contain everything you need to get started with the core rules and a guide to putting together your salvage company along with some hired guns and pirates to liven up games. It's also got the campaign system too along with an assortment of scenarios to play out!
Distant Worlds was the first expansion to the rules and came with a guide to playing forces of Asteroid Miners and Hydrissians, an alien race with an interesting appearance and very different motivations to human warbands.
The last supplement was Alien Evolution which introduced the X-12 Robot cult, a renegade group of mekks who seek freedom from their human overlords and the Mephalians, a degenerate remnant of the Mimjip Empire who operate ancient alien tech.
I'll post up a bit of a guide to the rules next time but in the meantime, All the best and I hope folks enjoy perusing a rather fun set of old rules!