Hello.
Firstly, where will you be living? If it's in student residences, then everyone else will be in the same position, and very friendly and easy to talk to.
I didn't drink alcohol at all during freshers week, nor am I a fan of the screaming and shouting that tends to happen. People will normally have pre-drinks in someones flat, which I'd recommend going to. I never drank at any of those, but it's a great way to meet new people. I'm not a very social person myself, and tend to freeze up in these sort of situations, but people will be coming up to chat to you, so it's not too hard to initiate a conversation.
Here's a list of events for Freshers:
http://www.cardiffstudents.com/whatson/freshers/I would recommend going to the Societies Fair, so you can get an idea of what there is out there (plus we had free pizza at ours!). There is also an Official Facebook page for 2013 Cardiff Medics:
https://www.facebook.com/groups/197992660349668/?fref=tsI used it last year before starting uni, and it kinda helps you to relax a bit, chatting to other students and helping you feel that you're not completely alone. You may also be able to find other people who aren't into the whole partying lifestyle - a couple of people in my residences didn't go out a lot, and we had a great time staying in eating pizza and just chatting.
One thing that I ended up doing which you should definitely
not do is stay in my room all evening. Yeah, some drunk people can be annoying, especially the ones who have no control over their drink, but people during Freshers week are very chatty. It's unlikely you'll be standing around by yourself, people just come up to you, and you end up with your own little groups.
I can't remember much of Freshers week, so I'm sure someone can correct me.. but I think we had a few introductory lectures during that week. It was mainly by the Dean and Head of first year, and they showed us a diagram of what assessments and coursework you will have throughout the year, as well as all your panels. It should be particularly interesting for your year, since it's a new curriculum. You will also meet your medic parents, who should help you to fit in and guide you around the buildings and your lecture theatres. The main thing that helped me to meet people, since I'm not a party person, is the introductory lecture. Just sit anywhere in the lecture theatre, and start talking to the person sitting beside you - normally they'll just invite you into the conversation. It's very easy to get talking, and I eventually spent most of my freshers week (and indeed the year) with those people. There's loads of stuff to talk about, everyone's excited and nervous, and it's a fun atmosphere.
Again, my memory is poor (I'm gonna be a brilliant Dr), but once I moved into residences we were asked to register with a GP - they gave us the form to fill in, so it was pretty easy. Again though, I'm not sure where you're staying or whether you'll be living at home. I also brought my drivers license with me (any other ID is fine) to get my freshers wristband from the Box Office in the SU, but I think that's about it.
From what I can remember, you're given your login details for Blackboard (website where they upload information on lectures etc), and on there you can check out your timetable for the rest of the year. Everything is explained pretty clearly in the introductory lectures though, and if you are a bit unsure, there will be 300 other first year medical students with you who you can get lost with.
This is probably very useful:
http://medicine.cf.ac.uk/medical-education/undergraduate/september-2013-enrolment-information-i/timetable/Feel free to PM me, or indeed any of the helpful Cardiff medical students here (Elwyn is sexy), if you've got any more questions/worries. Like I said, I'm not a big party person, but it's very easy to make "acquaintances" during freshers week, and you definitely don't need alcohol. Believe me, there are people out there who don't drink, or at least know how to drink sensibly, and they're not too hard to find. There was a group of my friends in Solus during the first freshers event, none of whom drink, all huddled in a corner - and they all got along. You just need to find that little huddle.