[quote=Lone Wanderer]
You really did mean a small start, heh.Nevertheless, I look forward to taking control of this nation, got a few plans already brewing.Also, forgive me if it is already mentioned, but what do the civilian worlds do?
[/quote]

In this game, they do (quite simply put) nothing. They're a burden if you will. Places you will need to protect to ensure PO is maintained.
In reality they would be civilian outposts and small cities which would provide a small amount of resources, manpower and production to the larger empire (as a form of tax) but those quantities are all poured into the sector's hub in this game.