As previously advised, don't expect to find your best friends ever in halls.
Keep your distance from new chums for a few weeks until you've sussed out if they're idiots or not. Makes ditching them a lot easier.
Realise that your tolerance for mess/crap/"sharing" stuff/people wrecking your stuff will be a lot higher when you leave cos they'll always be one turd who thinks the policy is your stuff is mine too.
Don't be swayed into the "everyone else is doing it so why shouldn't I" mentality
Learn to cook & clean but don't reveal this skill until a few months in. If people think you're the domestic one from the off, you'll be treated like a skivvy for the whole year
Go to lectures
You will get sick at the start of each term even if you consume a small orchard of fruit before going back
Don't ignore mice if you happen to get them in your place of residence. They can get really bad.
Don't go in on a split phone bill if you can help it. All the arguements about who called for a taxi at 4 in the morning really get dull even with a book that everyone writes their calls in.
Try and make friends or at least have a chat with some second year students. They've been there, done that and can point you in the direction of the real ale pubs not the alcopop student bars and the cheapo shops.
Most of all, have fun
