How to ask a girl out?

Did she turn her head or looked down when she first saw you or the second or third time she saw you?

Does she laugh at your boring jokes?

Does she laugh around you?

Does she act nervous around you moving back when she sees you, fidgeting, talking low, not being able to speak around you, stutter when she speaks around you, or acting nervous and another way?

Does she seem shy or nice or ghetto or popular or confident ( even if she doesn't seem confident she can be confident just nervous around you)?

Does she flirt with you? Smiling, playing with her hair, talking in a flirting voice, or and a different type of flirting way

Does she sit by you or look like she wants to sit by you?

How often do you see her?

Does she walk pass by you?

How old is she or how old does she look?

How old are you?

How much older or younger do you look or are than her?

Does she reject guys often?

Does she like guys that kinda resemble you?

Do you think that you can build up enough courage to ask her out?