Use a reasonably-sized font: either 10 characters per inch or a 12 point font. And choose a font that is easy to read rather one that is decorative: "Arial," "Lucida," "Modern," "Palermo" or "Times New Roman" are some good choices. Scripted fonts are hard to read even if they do make your paper "look nice"; it is the content of the paper that is most important, and making it easy for your readers to understand that content is always a good choice.
In its more than 330 pages, the MLA Handbook for Writers of Research Papers covers literally thousands of technical details for the writing and publishing of papers, and should be consulted if that level of detail is required.
Nevertheless, there are a number of overall rules and general guidelines, which are normally sufficient for the preparation of most papers at the undergraduate level that require use of the MLA standard. For the purposes of this article, I have divided those into three distinct sections, as follow: