Wiki will tell you most of it, but for ALL the details (and there are a lot more than you might think) read the FIDE handbook (which is free, just google it).
For an example of an obscure detail, players can't earn norms at a tournament unless a certain number of countries are represented by the players there. I think it's at least 3? So you could score 10 out of 10 against GMs but still not get a norm.
So people choose their tournaments wisely (and there are tournaments that specifically organize themselves, and advertise themselves, as having norms available).
Title says it all.
I keep hearing things like "I made the GM norm" or something like that, and I know you need to get some norms to get the title.
But how do you get a norm? By beating a bunch of titled players? I think it's more complicated than that, though.
Is it?