Layout
The City is divided in a number of ways; the easiest of which being Overground and Underground.
Maps have been made available to those who need them. But don't be afraid to ask for directions if you need them. Some people aren't going to bite.
Overground
The Overground is where the majority of people live, work, and generally spend their time. It's where you'll find the twelve apartment buildings. It's where you'll find the majority of the stores, shops, and amenities. That isn't to say you wouldn't find them Underground too, but this is just where most of it is.
The Overground is also home to Xanadu and we're not talking about Newton-John which is home to the Gardens and the Zoo. Really, don't knock it till you try it. You'll see things that you'll have never seen before.
Apartments
There are twelve apartment blocks, each containing more apartments than you can count. There's always a free one if you need it, so take a look round and you should find something you like.
Some places come fully furnished. Some come half built. Some may just be a vast open space. Like I said, just take a look round. There are plenty of places in the City that sell furniture, so it wont take long to set up your perfect pad.
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Underground
The Underground may well span beyond the reaches of the City. There likely isn't a single person who's explored every inch of the Underground before. Despite that, the major paths have been mapped out for you already, as you can see in the above map.
The Underground contains a number of different bars, clubs, and the…less than legal types of stores. [Legal in terms of US law; not City law] It also carries with it the possibility of becoming food for some of the creatures that prey down there. But don't let that put you off! If you're careful, and you're prepared, then you can find all sorts of awesome stuff down there.
Stores and amenities
You can find a list of most of the City destinations
here. Again, if there's something you need, go ahead and ask. If one store doesn't sell it, someone else will. And they may well know where to send you.