I am the author of the book, "How We Did It". For the book, I interviewed 100 entrepreneurs from all walks of life. From the tech world, people interviewed include the founders of companies like Freelancer, Udemy, Fiverr, Tagged.com, Unroll.me, PluralSight and Grooveshark. Other people interviewed include consultants, Yoga trainers (YogaFit),bakers, jewelry makers, etc.

Writing the book was a huge experience for me thanks to the inspiring stories that these entrepreneurs told me. You can find it on Amazon here: http://www.amazon.com/How-Did-entrepreneurs-struggles-experi...

I recently talked to nearly 100 entrepreneurs for my book titled "How We Did It". One thing that I asked most of them was how to validate the business idea before embarking on it. One common answer was to set up a landing page and advertise it using the right keywords on Adwords. Are people proceeding towards the purchase/download from here? In that case, there is a market and you could work on your idea.

Incidentally, the chapter about idea validation is available for free here: https://www.dropbox.com/s/0evrb66hvg4ucoy/Preview-copy.pdf

This is the Amazon link for the book : http://www.amazon.com/How-Did-entrepreneurs-struggles-experi...