The thesis statement is the most important sentence in your entire essay. ALL other statements and concepts must be directly connected to it . Use transitions to connect ideas logically to each other and back to the thesis. It should introduce all your major points and show your paper's scope.
Gun control is beneficial to society.
However, you should try to balance your facts with a little creativity. Since your thesis will set the paper's tone, don't let it be boring. Let your readers know what you are trying to do. Although it can appear anywhere in an essay, American readers usually expect the thesis to appear at the beginning. Like everything else in writing, thesis statements are very individualized.