You can start off by making eye contact and smiling. Do you know who she is? If not, introduce yourself and start a-talkin'. Ask her about her weekend, or a class, there are millions of things to talk about. Always be sure to make eye contact!
Well, first u have to figure out why u chicken out. Is it because u think she wont talk back or nething like that? And i have the same exact situation with this guy ive liked 4 a while. I talk to him, but i get all shy and giddy and i dont know what to talk to him about. I just...sit there. lol