Shakespeare help please?

Okaaay I have to write an essay for school based on Shakespeare's four tragedies ... Hamlet, Othello, Macbeth, and King Lear. I have to compare all of the opening scenes and say why which one is my favorite..! Can anyone help me or find me a site where I'll find the right information..? It's just this is important and we weren't given any notes at all..? help please..:D