How do you pick up girls?

Walk up to a girl complament them walk away with a bunch acool kids n she come back n ask a couple qestions n act like your swave n then u got digits

wot if u got bad rep? as in u dont hang out wif the considered "kwl" ppl, and ofcourse if ur shy and cant jus say hey u look hot today? i need helps cos shes basically "a kwl person" and im not.