A good way to start any essay is with an attention grabbing statement, quote, or thought about the topic. The last paragraph, generally speaking, in an essay is the thesis statement that lists the main points that will be addressed in the essay.
As to Romeo and Juliet, one could make a good argument that their families were to blame for their deaths. Their refusal to make peace, to carry out the vendetta through many generations has set the stage for this tragedy.