3 typed, double space, Times New Roman, font size 12, margins 1 inch all around.
Employ mostly the use of facts (probable) rather then opinion. If you do use opinion, let it be an informed one-that is, after presenting the facts, you may make suggest a logical conclusion. That is one form of deductive reasoning.
Be sure that you take a stance in you thesis statement, and that you support in the paragraphs that follow with logical, well-research, unbiased supporting points.