[Ignoring that pessimist remark, which is also the only option available. Can't think about that too hard.]
There's not much to know, aside from what they cover in the shitty brochure. There's no money so you can just take whatever you need from the stores, or put in a request with the shitty Warden if there's anything else you need. Most of the Sectors have residential areas. I'm still staying in the Shelter but a lot of the people here move out to apartments or houses after a while.
There's several fast food restaurants in Sector 5, and if you don't want to eat there you can always make something in the Shelter kitchen or have the bots prepare it for you. There's also the Devil's Compass, where I work as a cook. [Choose wisely, young longnose.]