Some countries require a definite plan before the business gets approved but most do not feel the need for this. However, it is still your responsibility to protect your employees as much as you can and especially during work hours. A lot of business people find it difficult to come up with their own plan so they look for plan templates online.
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.