The introduction is very crucial! Be sure to state these three major factors:
1. Purpose: The reason why you are writing in the first place. State your argument!
2. Audience: The group of people who the context is directed to. Know their viewpoint on your topic. Relate to the audience and establish goodwill and credibility!
3. Occasion: When and where the writing takes place. Occasion can be also be determined if the piece is based on a memory, an actual event or a delusion.
Now, move to the body!