STEPS : 1.BE FRIENDS: Your first goal is to get to know about her, not just her look, as cool as that may be.
2.MAKE EYE CONTACT AND SMILE Eye contact is a perfect way to let a girl know you like her without saying so. Look her in the eyes, don't shy away and don't check her out below the neck at this particular time. If she meets your eyes, smiles back or blushes, then you may have a chance. If she frowns or gives you that "what the heck?" look, back off for a while. Remember though, she may get a lot of attention from men, so that look may be automatic if you are a stranger or near stranger. Don't give up hope over one little frown, maybe she has something in her shoe? Wait a while and try again later. Don't forget to tell jokes just make her laugh.
3.GO AHEAD AND INTRODUCE UR SELF :) Don't rush right up, take your time, remember, you are building a friendship. Being overly aggressive is likely to scare her or creep her out.
4.START A CONVERSATION WITH HER :Chat about something safe, like school, or the weather, and then ask her something about herself. Critically, listen to her answer! Don't talk about yourself too much. Keep the focus on her.Compliment her on something she is good at or interested in, rather than how she looks.
5.KEEP SHOWING HER ATTENTION If this is a fleeting encounter and will be your only chance to show her your feelings, flirt a little more than you would normally.
6. Be Patient. By giving her your undivided attention, she will eventually get the hint that you like her.
7Look for indications of reciprocal interest. Try to read her body language. Is she leaning into you? Did she just touch you lightly on the arm? Does she hold your gaze? If so, then the odds are she likes you too. Once you have figured this out what you do next is up to you. Options might include asking her on a formal date, swooping in for a gentle first kiss, or even the daring French kiss.