You've got your expectations set way too high, guy.
Not about the girl, but about what you expect to happen and how perfectly you're supposed to act in order to be worthy of coming within speaking distance. The first thing out of your mouth is supposed to be imperfect, just like you are. If it's not, how's she supposed to answer you? You're both human beings, still, despite your expectation that you should behave in some more than human and more than perfect fashion.
Complements are generally a good start, if you actually mean them, and if they're things that you've actually noticed. Anything that you've actually noticed about somebody else that's decent and honest is generally a good start. You might try thinking of three or four real things that you actually notice about her and actually like about her and the way she handles herself. Make sure they're very particular, like her taste in shoes, or the way she treats her friends when they're happy or when they're down. Something that's specific and lets her know that you really have seen her and find something about her specifically interesting.
I don't know if any of this stuff is helpful. I'd remember that the goal at first is not to meet the love of your life, it's to have a short talk with somebody that you think you might have some warm feelings about, and to see if those feelings on your part are real, and to check out just a little bit if there are any feelings possible like that on the other side. Some just look for small real feelings in yourself and in her. You're trying to find out if you actually like each other enough to have a short conversation, and you very well may not either way.
This is the way you find out, gently. Small goals, pay attention to small real feelings between the two of you to see if any of them actually show up within the first couple of weeks after you start trying to be friends.
Now throw out everything I've said and do it your own way. If I said anything that sticks, try it.
All my best, Bob Kaven