First year of uni is the easiest you'll ever make friends so be as social as you can possibly be, especially during first term. If people in your flat are going somewhere you wouldn't normally go, to hell with it, just join them. Join a few societies too. Like someone said before, you can weed out the crappy friends later. Also the advice about not buying books until you know you need them will save you a load of money, and it'll save you having to carry a shitload of heavy books around when you're moving all your junk to the car when you leave.