Do your sales before building it. Who would buy it? Make a powerpoint or pen&paper mockup, get feedback from potential customers. Build a landing page, track co

Do your sales before building it. Who would buy it? Make a powerpoint or pen&paper mockup, get feedback from potential customers. Build a landing page, track conversion to a 'Buy Now' button. For more info, check out 4H work week, Lean Startup, or http://firstround.com/review/90-of-feedback-is-crap-how-to-find-the-next-big-startup-idea/ http://firstround.com/review/90-of-feedback-is-crap-how-to-f...