A Marketing Plan Template lays out all the steps you need to take to develop a plan for online marketing. It can save you considerable time and money because it shows you each step to take and the sequence in which to take those steps.
A good template will provided a step_by_step approach with explanations as to why each step is proposed. The strength of the marketing plan derives from the integration of each step. So if you leave out a step, you may undermine your own plan.