This is something I have seen most people neglecting or not putting much emphasis on it. This holds a lot of weightage. Let me put it this way - if you think you will build something and they will come or you will figure out something later, you are mistaken. Make sure you have great go to market strategy before you start development on your product.
Write the strategy in different phases. Having clearly figured out 3 months of plan is a good thing to start
