Try asking your teacher for an outline. The basic rule of thumb is five paragraphs: introduction, 3 evidence paragraphs, conclusion. The first paragraph should have a thesis statement setting out what you intend to prove, and the middle paragraphs should prove it.
Here's a link to a handout I used to give my own students; go down to the sub-link that says "Clearly structured essays."
I often teach my students to write by encouraging them to use a simple, four-step process which I abbreviate as "SIEL." Here are the four steps:
S: State your argument
I: Illustrate your argument with a quotation.
E: Explain in some detail how your quotation does indeed illustrate your argument.
L: Link to the next argument.
Here is an example of this pattern as used in an essay about a poem by William Blake:
[STATE:] William Blake’s poem “The Chimney Sweeper,” from his Songs of Innocence, clearly exemplifies many of Blake’s most prominent and common themes. [ILLUSTRATE:] For instance, his standard emphasis on the beauty of nature appears when he describes how the chimney sweepers, when they are freed mentally (from their woes), "down a green plain, leaping, laughing . . . run / and wash in a river and shine in the sun" (15‑16). [EXPLAIN:] These lines illustrate Blake's frequent emphasis on the beauties of nature by depicting innocent children in an appealing natural landscape. Natural beauty is emphasized through the positive references to the plain, the river, and the sun. These references imply earth, water, and fire, three of the four traditional elements of nature (air being the fourth). The children themselves also seem naturally beautiful since they "shine." Human beauty here becomes part of natural beauty. [LINK:] However,
[STATE:] a second major theme of Blake’s verse is a stress on personal and social freedom.
A paper on Fitzgerald’s The Great Gatsby might use the SIEL method as follows:
S: Often single sentences in The Great Gatsby illustrate many of the novel's major themes and techniques.
I: One such sentence, for example, is the following: QUOTE A REPRESENTATIVE SENTENCE HERE, SUCH AS THE FIRST OR LAST SENTENCE OF THE BOOK OR THE FIRST OR LAST SENTENCE OF A PARTICULAR CHAPTER.
E: EXPLAIN, IN DETAIL, HOW THAT SENTENCE IS A TYPICAL OR REPRESENTATIVE SENTENCE FROM THIS NOVEL. FOR EXAMPLE, HOW IS IT TYPICAL IN THE IMAGERY IT USES? HOW IS IT TYPICAL IN ITS TONE? HOW IS IT TYPICAL IN THE WAY IN CONTRIBUTES TO CHARACTERIZATION OR ATMOSPHERE OR THEMATIC DEVELOPMENT?
Many of my own students have found that using the SIEL method makes the writing of papers much easier and much less puzzling or mysterious than the process might otherwise seem. Using the SIEL method can help writers order their thoughts logically and can help give them very clear ideas of what they should do, step by step.
I second the use of OWL at Purdue. When I was tutoring I always referred to their site for information.
To write a good essay, you have to know the basic parts and how to apply them. Simply put:
Outline, Introduction (including Thesis), Body, Conclusion, Bibliography.
Write a basic Outline of the information you want to convey. Present your Thesis clearly in the Introduction. Support your arguments in the Body. End with a repeat of your Thesis and what you can conclude from your research. Cite all your sources in the Bibliography.
One site that I always give to my students is the OWL writing lab (supported by Purdue University). The site has helped many of my struggling writers fine tune their essays given they can read and study the site at their own leisure. The site is linked below.
Before you can write an essay, you need a good thesis. Your thesis is your main idea statement. Once you have your thesis, you can gather ideas for the body of your essay. Suppose you have the following question: Should students be required to wear school uniforms? The next step is to plan your ideas to support your position. If you feel students should be required to wear school uniforms, decide what three reasons you may have to support your position. Your thesis would be the following: Students should be required to wear school uniforms for various reasons.
You may decide that school uniforms would create a sense of unity among students. Also, school uniforms would lessen the tension that exist due to some students who cannot dress as preppy as others. Thirdly, students who are required to wear school uniforms spend less money purchasing clothes. These three ideas would become the topic sentences of each of your body paragraphs.
I hope this helps.