I think being able to talk to people is more important than learning how to flirt. Once the talking begins sometimes the flirting comes with it - and you don't have to be overly seductive when you flirt, a smile or a wink or a brush on the shoulder are all signs of flirting. Body language is huge. One guy that I had met, started with me simply glancing over at him a few times, I was on myself later, he came over and said I looked upset and asked what was wrong. Very perceptive because I was upset, we played pool the rest of the night, and occassionally we'd run into each other until we finally exchanged numbers. Another time I simply chatted with someone in line at the grocery store, we both had the same eye roll going on with the cashier - great ice breaker.
Be yourself, make sure you're using your body language and stay confident...guys like confidence.
at 4:36 PM on Aug. 3, 2010