You just need a little confidence and some experience with women and you’re going to be fine. Your instinct is correct — if you go up to her and introduce yourself, that’s the first step! Making conversation is next. If you don’t have anything in common (you actually work in the same place, so that’s a start, and you’re the same age, so you may have other things in common, too), you can compliment her on something. Using your own style, you can tell her you’ve noticed her because she’s very pretty and there’s something about the way she walks (whatever it is) that caught your eye and has kept your interest and you just wanted to get to know her a little. See what she says — you don’t have to control the conversation — you can let it flow and see if and how she responds. Then ask her if she’d like to have a drink (coffee, wine, whatever) after work on Tuesday — pick a specific time and date and place to pick her up or meet.
I hope that helps. Let me know how it goes! And please follow me @AskAprilcom on Twitter and on Facebook at this link: [url][/url].