Campaigns in Praesidius Sector can be as complex or as simple as you want, involving all, some, or just one of the Warhammer 40,000 universe games. In out campaign, we use a combination of all of the games with the following sets of campaign rules combined to make an interesting and fun, if rather complex, campaign. You may wish to make up your own campaign rules or just use certain ones.
The campaign rules sets that we use in our campaign are:
Warhammer 40,000 3rd Edition rulebook campaign rules (for 40K regiments)
Gav Thorpe's Planetary Assault Rules (for assaulting planets)
Quinton Woeppel and Erik Setzer's BFG/40K/NECRO Campaign Rules
Battlefleet Gothic campaign rules from Battlefleet Gothic Rulebook
Necromunda Gang Campaign Rules (for Scouting parties)
These rules are all used in conjunction with each other to create a nice, steady campaign which involves many things that you would expect to be occuring in an ongoing war to conquer a lawless sector, such as the refitting of starships, the awarding of honours to characters and commanders, the buildup of experience for veteran forces, etc.