When you have an assignment like this, it is often best to choose a product or service that you have some familiarity with or that you want to learn more about and that you are enthusiastic about. I do not think you can really "market" a company per se, without marketing whatever it has to offer. If you have a great familiarity with technology and enjoy using it, a technological product or service might be a good idea, for example, the iPad, the iPhone, Google, or Facebook. Sometimes I suggest to my students a marketing plan for their school, which offers a service they are already using. If you are someone who enjoys reading, perhaps the marketing of books would be enjoyable to you. Also, if you have a vision of opening up your own business someday, what service or product would you be selling? You can get a jump start on that business right now, by working on your own marketing plan.