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.
Setting up a plan isn't difficult, especially with a good template. Whichever method you chose, keep in mind that the goal is to organize a training activity that would make your employees more productive, for you to ultimately gain more profit.