Introduce yourself first, tell them some of your intersts, then tell them why you are interested in being their friend. If you want to learn a language from them, you should them them. For example, Hi, my name is DaBing. I'm _ years old. My interests are swimming, basketball, and etc. I would like to be your friend because I want to learn English from you.
can't think of anything else. I'll tell u later. =D