My name is Lon.I come frome vietnam.I am so confuse right now when i do not know...?

what do i have to do at the? fist step for my major. It is big different with VN.I am in ESL cl right now. I want to repair and choose the major i want to study. Nobody tell me what cl i need to take to become this or this.Is it in America have some book they list all kind of major and tell you what will you need to do for that major and what is that major for in America. Can some one give me the recomendations? I woul apriciated.Thank you