I am going to host a RP for my friends (more or less based on Dark Heresy/Rogue Trader mechanics), but I don't know many of the details about the everyday stuff in the Imperium of Man, and many other things. I thought about making the story start in a hive city, and my friends would be militians that are assigned minor missions until they're proven worthy to do more serious stuff. I don't want them to be Imperial Guardsmen because I want them to have some freedom of choice and movement (as IG they'll be told where to go and what to do, and of course they might die too soon). I also thought about their characters being mercenaries of some sort, but how often does the Imperium hire those? How free are they? How exactly does that work? Another thing, if one of my friends wants to roll another race, will most, if not all relation with the Imperium be hostile? For instance, an Eldar or Tau player. If I stick to the first idea of the militia guys, these are some of the doubts I have: 1) how do militia guys even work? What task can they be assigned and who would "hire" them? 2)In a Hive City, how exactly is it organised? 3)What is the chain of command of the HC? 4)What is the role of the Imperial Guard inside it? 5)Do HCs have bars/pubs as we do today? 6)Do they have neighbourhoods? 7)Do they have public transport? If so, how is it? 8)How is food distributed? 9)How is a regular civilian's house? 10)What is the role of the Mechanicus there? 11)How hard is it to leave the planet, to buy a weapon, to acquire knowledge, to acquire wealth? 12)How and why do rebellions appear and how does the goverment (?) of the Hive City deal with them? 13)Can a Hive World have a population of feral orks without it being utterly destroyed? 14)To my intents, is it better a Hive World or a Forge World? What are the main differences and how would that affect my gameplay? 15) What is the exact relation of the Imperium with other races? Are they all hostile? Is there xenos commerce? 16)How hard is to buy your own ship, and how would a small freelancer group do an interstellar travel? 17)How are weapons stored/distributed? 18)What is the exact role of the Administratum? 19)What is the exact appearance of a HC, vague descriptions aside? Low/High ceilings? Are there streets and cars? Are there stores? There are town halls of some sort? 20)Do hive cities fight each other the same way countries make war to each other nowadays? 21)What is the how does the Adeptus Arbites exactly work inside a HC? Sorry for so many questions/wall of text, but I want this game to be as lore-accurate as possible, and I can't do that without knowing these and other things.