What was the outcome? As much as 90% businesses started by entrepreneurs and small business went busted or failed within a year. I experienced one of the many busts few years ago (with my cafe business) because i don't really have a proper and "the few solid sheets" called a marketing plan.
But, I don't specifically mean my own Marketing Plan S6PEC Framework because there are so many versions and gurus out there that can give you the benefit of marketing plan. Of course I am going to say mine is a lot better because it's a practical and practitioner's guide. Other than being a consultant, I also have performed marketing manager role, entrepreneur role, business manager role, investor and student of entrepreneurship (during my MBA!). But that's not my main point. My main point is for you to have a marketing plan to guide your business. Which one? Well it is up to you!