First be quite friendly to her always give her a smile and don't miss a chance to spend time with her.slowly slowly she befriend with you then express your feelings
First you should b kind to her you should help her in any situation.b frank with her don't abuse anyone in her presence and absence.if you do that she will think you r characterless.b kind help everyone in her presence then v will c that she will b impressed or not.I challenge you all that she will b impressed
First of all you must understand girls look for good character if have one such character then surely she will love you and you must not tell about your love surely her feel it love is felling between mind let it be know by another mind also my dear friend
Be nice to her never let her down don't make her very nervous do something for her then,make one of your family know her and last invite her to the movies and tell her your feeling for her.
You should be yourself and like them be impressed by you if you are good at sports then show her how good you are if your smart then ask her if she needs help with her homework but don't stray away from who you are