Book Reports / Hamlet essay: what was Shakespeare trying to communicate? [3]

im having some difficulty with the essay i was given, the question is:
what was Shakespeare trying to communicate to his audience in the play hamlet?
I understand how to write essays but im a little confused on what im impaling Shakespeare to be saying through the play hamlet. im using the theme hamlets uncertainty with the technique soliloguy for my first paragraph. for the second, revenge using technique foreshadowing for the final paragraph im using appearance vs reality and the technique symbolism. there are my chosen theme. i dont know how to start my essay because i dont know what im trying to explain. please help me.