Mayank C and his friend from his engineering college had an idea last year. Today, that idea - an app which creates a virtual wallet - has translated into into a billion dollar company. Mayank is 28, the sort of heady Bangalore success story that inspires the launch of nearly 10 start-ups every month in the city. He says the idea was the easy part. What came after wasn't. "We did not know how exactly to go about starting a company. We learnt from our mistakes, the first six months was about learning and not value-generation at all."