How To Write Buisness Plan . Set up blocks of time for work with target dates for. Write a thorough executive summary. Writing Business Plans for Investors 6 Questions You Must Answer from www.businessplantemplate.com Include a cash flow forecast, usually broken down on a monthly basis and presented as a spreadsheet. Say what you need to say using simple language (no jargon) in as few words as possible. Outline your marketing and sales plan.