A thesis statement is a clear statement of your position in an argument essay. It sums up your topic, your position, and a brief "why" for your argument. This sentence generally appears at the end of your introduction.
A strong thesis:
For more on thesis writing, view Grand Prarie Regional College's guide to The Writing Process and these examples and myths about thesis statements.
An argument paper moves from the general to the specific in justifying your thesis statement.
Your paper should include an introduction, body, and conclusion:
The Body should have four elements (TTEB)
See the Purdue Online Writing Lab for more about building an argument paper.