Some marketers come up with great ideas and start running with them right away without answering the most important question(s).
Are you providing a solution to an existing problem? Or are you fulfilling a current need?
Where there is a problem or need- there are consumers eager and ready to embrace your solution.
Before you move forward with any new concept, idea, business plan, etc. you must first establish what the need is for the consumer or demographic you are going after. Was there an existing problem and your idea is the solution? Therefore consumers will come or respond.
Your idea may be something that doesn't exist yet but is there a need for it? Without a need it will be a lot harder for your idea to reach consumers and succeed.