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.
The second method is easier. You can download a training plan template from business or management tools websites. Some templates could cost as low as บ. There are generic ones, while there are others that are so extensive that every aspect is taken care of.