Research your topic. Ensure you have an adequate amount of information to cover three main points in three paragraphs.
Make an outline of your essay by developing three main points that answer the essay question or cover the topic.
Begin your essay with an interesting sentence that intrigues the reader so she wants to read on. This should be a general statement that addresses your topic.
Write a thesis statement, which will go in your introductory paragraph. This should include all three of your points. Don't worry if it doesn't sound interesting. The purpose is to tell the reader what your essay will be about.
Write your three body paragraphs, one for each of your three points. These should elaborate on your thesis statement. For each body paragraph, have a topic sentence that tells the reader what the paragraph will be about. Include your examples and/or quotations in your body paragraphs to support your thesis statement. Each paragraph should have at least three sentences.
Finish with the conclusive paragraph. Your fifth paragraph should be just three to five sentences, and its purpose is to summarize your essay. However, do nor merely re-word the introductory paragraph. Re-state your thesis, and also add one or two broader points, such as what your main thesis might mean for the world, or why your topic is important.