No first person/personal pronouns (tone should be formal).Always write about literature in the present tense (Shakespeare creates. Macbeth believes)
Your essay should have a thesis that presents your overall argument, and evidence to support your thesis. In a literary analysis essay, your evidence simply comes from the piece of literature itself (quote specific lines from the play that demonstrate what you are trying to say).  ACE format not required, but its definitely a useful model to follow.Parenthetical citations ARE required for quotations and lines cited/referenced/discussed from the play. This is a verse play, so citations would include the act, scene, and line(s) separated by periods.  (Macbeth 2.3.35.)