Bill Hartman proposes the MoSCoW mode for helping Designers to set creative priorities but it works for all new initiatives basically like requirements, new experiences or new products. MoSCoW is a technique for helping to understand priorities.
If you want to design the marketing strategy for your business, you should first start to analyse where you will play. What does it mean? It means that your product/service will be associated by consumers/buyers with other alternatives they have on the market (maybe no alternative exists which means that you creating a new category also referred as a blue ocean).