In an intro to any essay, you want to hint at what is to come. But to start- you want to have a thesis and a hook. A thesis is what you want the reader to take away- what your main point is about your essay. A hook could be a rhetorical device, such as a statement using facts (logos- one rhetorical device), or something along those lines. So ask yourself- what are you trying to get the reader to THINK or what are you trying to get the reader to DO? Best of luck! Let me know if you need any more help.