All Rules for MLA Format can be found in your Writer's Inc.
(you knew you bought that for something...)
But just for kicks, here is a short checklist to make sure your teacher will smile when she looks at your paper:
___ Did you put your heading on the left?
___ Did you double space your heading?
___ Did you make sure your heading is no longer than three (3) lines?
___ Did you double space the body of your paper?
___ Did you get rid of all those ugly extra spaces between paragraphs (and between the body and the heading?)
___ Did you use 12 point font?
___ Did you use Times New Roman?
___ Do you have 1" margins (your computer should be set up this way...)