Start Small and Listen. That is Rachel Andrew‘s advice in this helpful article in Smashing Magazine. No matter how many articles you have read on business, one more is never a bad idea. This one is likely to contain both new ideas and reminders for you.
“The goal of a startup is to find the sweet-spot where minimum product and viable product meet — get people to fall in love with you. Over time, you listen to your customers, make improvements and raise the bar on what viable means — making it more expensive for competitors to jump in.”