The plan should cover one year. For small companies, this is often the best way to think about marketing. Things change, people leave, markets evolve, customers come and go. Later on we suggest creating a section of your plan that addresses the medium-term future--two to four years down the road. But the bulk of your plan should focus on the coming year.
What's the relationship between your marketing plan and your business plan or vision statement? Your business plan spells out what your business is about--what you do and don't do, and what your ultimate goals are. It encompasses more than marketing; it can include discussions of locations, staffing, financing, strategic alliances and so on. It includes "the vision thing," the resounding words that spell out the glorious purpose of your company in stirring language. Your business plan is the U.S. Constitution of your business: If you want to do something that's outside the business plan, you need to either change your mind or change the plan. Your company's business plan provides the environment in which your marketing plan must flourish. The two documents must be consistent.