I am from a long term relationship so fresh again in the streets + I live abroad. I noticed more than a few times guys are checking out on me (when they are in twos or threes). Like for ex. in the bus station i'm 2 meters behind them sitting and they are looking on me. But that was the time i'm not yet ready and not actively looking. These are really handsome tall guys. Also in the gym I saw straight model looking guy checking me out 4 times. Aside from these occasionally i get catcalls but this is something i don't entertain (was normal also while i'm in a relationship). I really want to get to know some new people for hooking up and not serious.
What is the step by step to flirt and get these guys get comfortable to approach me?