Business Plan Mind Map - that's exactly the level you should look at this topic in an early stage startup environment. Use it as a brain teaser, be very selective (e.g. don't worry about balance sheets etc.) and don't overstrategize. Stay humble and lean and capture your initial data in the lean or business model canvas - not in a heavy business plan document.
Learn How To Write A Killer Business Plan That Will Make Your Business Stand Out + 5 reasons why you need a business plan | Click through to get advice on how to start your own business and create a rock-solid business plan. Use my free business plan template to get started.