Some common features of MLA style formatted papers include:
Times New Roman font
12-point size text
One inch margins
Title of paper centered
Header with last name and page number in upper right
Double spaced
In-text citations
Italics used for titles of works
Works Cited page at the end:
alphabetical order by author's last name (or title if author unknown)
hanging indents
MLA Guides Online
NOTE: The main difference in the 9th edition of the MLA Handbook from the 8th is the inclusion of more examples and explanations. There are not any major formatting changes.