Hi,
Have you asked your teacher or professor how to begin?
You need an outline first. I would go to the library, ask where old term papers are, and look at some of them. Writing an introduction takes some practice, but one has to understand their topic from the research they do. There are guides in the library about how to write an introduction, and also online.
Your teacher would be the first to help you begin. I do wish you good luck.
PS; Here is a link with some very good tips on writing an introduction:
http://owl.english.purdue.edu/worksh...riteintro.html