This does not need to have the detail of the micro outline, with each sentence decided, but it should include as many paragraph main ideas (main ideas include the topic and what you want to say about it) as you can, at least at this early point. You’re not stuck with this outline, so your structure is free to adapt and grow as you draft later on. This should just give you a general idea where you’re going with the topic and to help you identify what gaps you have, where you might need more thinking. For an idea of what to aim for