Thinking about asking out this girl?

I met this girl who works at the bank. I go there every time i put my check in the bank from work. I was thinking maybe next time i see her ask her out.I was thinking of maybe asking her how she's doing, n what she's been up to, then before i leave ask her out. I was wondering how i should ask her out? Hey so i saw Scott Pilgrim the other day and it was really awesome. I think you should check it out sometime. Well i was wondering if ur not busy this "day" if you want to see it w/ me. Or say the same thing but instead say I heard Scott Pilgrim was a good movie...Or should i wait and maybe ask if she has a facebook b/c i'd like to get to know her better.