Ok so I am sitting in a similar boat with two girls and am wondering what I should do...
One girl works with a girl I know, I've had my friend tell her for a few weeks about me just to build up an image, what I did was go into her store open her directly with a compliment and then leave without telling her who I am (the guy her friend has been talking up) then when I was out with her friend she introduced us and the target was shocked. SHe was yelling "noway I can't believe it's you!" "you made my day that was awesome". To which I played off and didn't spend long talking to her (because I was high as shit and didn't think I'd be able to respond without sounding like an idiot).

Girl number two I also went into her work as a stranger complimented her and left. I saw her out the same night an she tapped me on the leg to say hey but kept walking so I didn't try an talk to her. I went into her work again since but we didn't talk, only made flirty eye contact and a quick see ya (as I was being served by another employee).

I feel as though both of these girls are ready for a deeper interaction than just a stranger to make eyes at. Now as I am trying to learn pickup I think I will approach each in a different way so to see what is and isn't effective.
Girl 1: being cuter and knowing people I know, I will go into her work and number close in person.
Girl 2: I'm probably just going to add her on Facebook. She's not really my type anyway so I'm not too bothered if it doesn't go anywhere.

Is this a good way to learn or should I be trying my best with each girl?

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just because my name is safety doesn't mean i like condoms

Hey mate, from experience, the lower your expectations the higher the outcome.. If your expectations about something are high, you will be disappointed.

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In this world, you don't get what you deserve but what you fight for!