Make the most of freshers week! It will be the craziest (un)forgettable week of your life. I wish I'd tried to talk to as many different people as possible because some of the stories I heard about flatmates ending up at parties in accommodations other than their own after the nightly events were hilarious.
Without wanting to sound too much of an alcoholic; Monday night is easily the best value night to go out. As mentioned XL do 99p J-Bombs but if you plan to go out on a Monday, it is worth checking out Molloys pub. Based on last year, Quids night is £2 entry, £1 pints (Carlsberg and Strongbow i think) and then i think Jagers/Snakebites are like £1.50. Then your route to XL or Second Bridge is well fueled!
I would also strongly emphasize the "only 40%" generalization. I know a few people who did struggle to pass, although it is only first year, you may find some of the units a lot harder than others, so make good use of the study period - when halls are generally dead - and go hard in re-freshers week/summer once exams are over!
I should probably be able to think of loads but I'm just gonna end up reading other peoples and going 'oh yeah, I'd never thought of that'....