I just listen and observe.
My experience last week. (note* i dont remember EXACTLY what i said, but this is roughly what i said.)
Saw a HB8 having lunch at a café near work when on my lunch break.
Walked up and said something like "omg that sandwich looks amahzing"
her- yeah its pretty good
me- which one is that?
her- italian BMT
me- ohhh i love that one, dont you love it when they melt the cheese, just right so its not too gooeeey?
her-Yeah, i like it toasted just for the melted cheese
me- You know i come here almost everyday and haven't seen you here before, do you live around here? (here i sat down with her), im NEW2GAME by the way.
her- yeah, me and my family just moved here from sydney (so she moved from New South Wales to Queensland, easy 800mile treck), I am HB8.
me- Oh no kidding how do you find the sunshine coast?
her-Bla bla bla, something about ppl being nicer
Me- what, so people in sydney arent nice?
her-blablabla busy...blablabla
Me-bla bla, something like asking her if she knew how to have fun in sydney
her- yeah blabla clubbing blabla
me- omg you are a total party girl, you know there are some pretty good places around here. Me and a few friends are going out this saterday, you should come
Her- ummm yeah ok (she was resistant, but i think its because she was a bit cautious, because she wont know anyone)
Me- pass her my phone, exchange #'s, great, i have to get back to work but i will call you later.
Now i wasnt particularly PUA'ish, others have different routines/theories. I kept it simple that day, as i was on my lunch break. Seeing her tomoro night

. Some light kino was involved (shoulder/arm brush. sitting touching legs) , but didnt want to turn it into an essay
Thing is, you always have some tangent to go off on.
So u see someone playing with an ipod. Ask which model it was....you were thinking of getting one. How is it. What kind of music is on there. What is her favourite band. So is she a rocker or R&B person. Maybe say you have found rocker's to be the best company etc.
Its all about listening to what she said, then take it deeper