Be specific. Being specific is just as important as being concise. The details will help you drill down into how you will actually deliver your plan.
Appendices and Exhibits. The appendices and exhibits section contains any detailed information needed to support other sections of the plan.
Sales and Marketing Plan. A description of how you intend to entice customers to buy your product(s) or service(s), including advertising/promotion, pricing strategy, sales and distribution, and post-sales support if applicable.
Any funder worth his or her salt wants to see it right off the bat. Moreover though, a solid business plan is a living document that will continue to guide your efforts as your business grows. A lot of those mistakes (most of them, in fact) are the result of poor planning. Bad location, a marginal niche, having no specific user in mind, raising too much or too little money--all of these issues can be prevented or at least mitigated with good planning.