I think when one thinks for starting, the very first thing one has to embrace is risk because no one   actually knows whether it's going to work or not. Also, one must not lose hope because there are going to be ups and downs and those even exist in the well settled business also. One has to give 3/4th part of the day to the business in the initial days as there might be huge workload. But eventually, one must remember that "Rome was not built in a Day...!!"