[@Kho]

If we start in a pre-populated world, that's a different matter. I'm still of the opinion that letting the players generate the world would probably be more engaging for them (and less work for you), and avoids forcing them down pre-existing tropes. (For instance, the first sentient life in Mk.2 was not humans, as one would assume is standard, but hain, which really personalises our universe.) If you wish to do otherwise, though, then go ahead.