An easily readable font (most professors prefer Times New Roman)
11-13 point size (most professors prefer 12 point font)
Double spacing
1-inch margins
1/2-inch indent on the first line of each paragraph in the body of your paper
Hanging indent on each Works Cited citation
Your last name and page number at the top right of each page header
Heading information at the top left of the first page:
Your Name
Your Professor's Name
Class and section number
Date
For more details see "Formatting Your Research Paper" on the MLA Style Center.