I'm doing the same, only with A Midsummer Night's Dream. I think one of the most important parts is doing supplementary reading to use as evidence/context in your essay. Search the internet for anything related to the comedy of your chosen play, then search for articles about comedy more generally (e.g. the various theories of comedy, etc).
Make sure that the title you choose allows for your to debate, but is also quite specific so you can show that you were able to precisely answer the question.