I mentioned the financial aspect of a plan earlier, so let me add this. Another fact about financials to consider: not all business activities are about making money. Point being, in most enterprises financial considerations are centric to the document. But there are some other considerations. For example, a few years ago I wrote a plan for a new subsidiary that was focused on developing an inventory of patents. The potential financial returns were years into the future. Those patents may or may not ever have commercial value. Another example is a non_profit enterprise that has need for a complete roadmap for growing their profile in a market, of which a marketing plan would be the centerpiece.
What do you need to get your business rolling/growing, and what will it cost? This is arguably the most painful part of business planning. Yet, what is the point of having a plan if you don't know how it all adds up financially? You may not know how to put all the numbers together on your own. If that's the case, invite or even hire someone to help you sort out the numbers. Aside from any potential revenues earned from sales of your product or service, you'll need to know your fixed expenses _ what it costs you to run your business whether or not you sell a single item, and your variable expenses _ what it costs you for each item sold. Naturally, in the early stages of planning a business, you will be doing a lot of forecasting, and your numbers may not be as accurate as you'd like them to be. So, you'll want to be as conservative as possible about how much revenue you'll generate and how much your business will cost to run.