Following are online resources to help you with MLA Citation Style. The first link is a brief guide that contains formatting style and examples for the most popular types of sources. For more obscure sources, refer to the MLA Handbook for Writers of Resesarch Papers, 7th edition. These handbooks are available for use in the library or to check out. Visit the other sites listed for more options. You might find one that you particularly like.
This screencast does not contain sound, but it does have an useful interactive component at the end of the screencast that you will find helpful. So be sure to complete the interactive component.