The first step involved in writing a business plan is the executive summary. Here, include everything that you would cover in a five minute interview. Explain the fundamentals of the proposed business: What will your product be? Who will your customers be? Who are the owners? What do you think the future holds for your business and your industry? Make it enthusiastic, professional, complete, and concise.
Next, I would develop a capital plan identifying dollars to be spent on the business to increase its overall value. While all capital dollars may not entirely be discretionary - i.e., investing dollars for anticipated return from growth - it is necessary to determine how capital dollars will be allocated whether for discretionary purposes or general maintenance. Projects that require capital are critical for the company growth and must be managed to their desired return, avoiding shortfalls in ROI or issues involving capital creep.