Lt Aldo raine, on 26 January 2012 - 05:58 PM, said:
jeez just relax. Dont make a science out of a social event.
Fair play, if it's not something beautifuldoll has done before then it's not necessarily as simple as, "just relax". In fact, I think it's brave to state that it's something she hasn't done before and that it's unfamiliar because I bet a lot of people take their ability to socialise in those situations for granted.
As for your questions, beautifuldoll...
When you mentioned you were thinking of asking someone to the pub, you phrased it as a question. In that case, yes, I'll join you. Mine's a pint!

Whoever you're intending on asking, there's no real reason why they'd refuse, no matter what the context. Whether it's a friend or a dating situation or whatever, it's a pretty regular and casual thing for many people to do so there's no reason why that particular someone wouldn't be happy to go along with you. So if you were worried at all that they might say no, don't be.
Wear whatever you're most comfortable in, although be mindful that it can get warm if there are lots of people around so it's best to be comfortable in that regard too and not wear too many layers. I can also understand why you might put a bit of thought into it if you feel a need to cover your acne. In both senses, what you suggested sounds fine to me.
As for the seating, most pubs have a mix of tables with chairs and also sofas so you'd be free to scope it out and again, do what feels comfortable. Kind of funny actually, I always find the sofas in pubs ridiculously comfortable so I'm more likely to want to take a nap than I am have a chat.

Depends on the situation but either way, you'd want to be able to look at the person and make eye contact. If you want to kind of do that in stages without getting so close, a table is ideal for that because it puts space between you without it being awkward or anything.
Totally up to you what you drink, of course. Pace yourself, alternate between alcohol and soft drinks, only drink soft drinks, whatever. One thing I would suggest though is not to rely on alcohol as being the thing which lets you relax because, in my experience at least, it's only a temporary solution. If anything, you might want to keep a clear head so that you can relax into the situation as it progresses and indeed learn from the social experience as you go. Go ahead, have fun!