if you re single and actually are good looking and smart, confident enough, you simply stay in her view's range and attempt to catch her attention just standing or sitting there doing nothing. If you notice by some signals she sends that she's interested in you, then you know you have a chance and can then either go for it immediatly: "hi, do you want to drink a coffee with me" or if you re sure to meet her later and regularly at the same spot you can wait a little longer before attacking. Maybe you ll learn more about her looking at her from a distance for a while. Make absolutely sure you dont give a fuck about her. You can even stalk her a bit as long as you re not too invasive.
As simple as that you cock breaths. If you want something just go for it , if prepared carefully you ll have a clear answer immediately. Once contact is made it's another chapter.