The first response seems a bit of a lightweight.
I'd say 2-3 pints to get most guys my age tipsy, 4-5 to get properly drunk, once you start moving toward 8 you're getting toward messy stages. This in an average 3 or 4 hour session.
At parties a lot of people drink spirits straight from the bottle, so thinking in terms of shots isn't going to help. Most people tend to have around half of a medium sized bottle of spirit to themselves at a party, or such is my experience, and that'll get you pretty decently drunk. That's half of the larger square bottles by the way.
Learn your differences between Cider, Larger, Ale and Stout. Make sure you knwo things like to buy off brand vodka or cheaper brand vodka, Imperial is just the same as Smirnoff, but a few pounds cheaper. Get to know some regular mixes, like Vodka and Coke, Malibu and Coke (for the girls), Jagerbombs, Sambuca and Lemonade and stuff. Then you've got a good grounding.