Go out as much as possible in freshers. Try and meet as much people as possible - don't just consign yourself to your flatmates, you've got all year to get to know them. Don't be afraid of one night stands or flings. Take some food with you, but more importantly, alcohol - preferably something that you can share. Keep your door open at all times, unless you're sleeping or masturbating. Take as much things as possible, like Xboxes, Wiis, etc. that you can use to help socialise.