You should allow yourself a couple of months to write the plan, even if it's only a few pages long. Developing the plan is the "heavy lifting" of marketing. While executing the plan has its challenges, deciding what to do and how to do it is marketing's greatest challenge. Most marketing plans kick off with the first of the year or with the opening of your fiscal year if it's different.
Chart to success: We all know that plans are imperfect things. How can you possibly know what's going to happen 12 months or five years from now? Isn't putting together a marketing plan an exercise in futility . . . a waste of time better spent meeting with customers or fine-tuning production? Yes, possibly but only in the narrowest sense. If you don't plan, you're doomed, and an inaccurate plan is far better than no plan at all. To stay with our sea captain analogy, it's better to be 5 or even 10 degrees off your destination port than to have no destination in mind at all. The point of sailing, after all, is to get somewhere, and without a marketing plan, you'll wander the seas aimlessly, sometimes finding dry land but more often than not floundering in a vast ocean. Sea captains without a chart are rarely remembered for discovering anything but the ocean floor.