Mature women only please. She likes me, but how do I get her to say yes to going out? I don't want to blow it.

This girl at a store has been flirting with me big time. I like her, and I am not used to picking up women (just got out of a very long term relationship). I'm in my 30's and this girl is in her early to mid 20's i'd say. She has been looking at me and smiling everytime I am in the store. She also (very) recently began wearing skirts and heels (she always wore drab "earthy crunchy garb" before. She's really cute! and she seems to appear out of nowhere wherever I am in the store, but sh'e real subtle about it. She also is always looking at my mouth and eyes, and touching her hair, so I think she likes me. My problem is that I am out of practice with this stuff, and I don't want to blow it. I think she's working tomorrow night, and I bet she'll at least smile when she sees me come in. What is the best thing I can do? I'm NOT looking just for . I'm a good guy who mostly just wants to date. I don't want to come on too strong or be too slow to act either. What's my best bet?