Make sure you deliver what you said you would. It's so tempting to under deliver when the picking are so ripe and plentiful. Honesty is the difference between a rich, successful entrepreneur and a crook. Start cheating people and you become a thief when there was no good reason to. Please allow me to give an example. Let's say you are selling a "how to properly groom your dog" guide. Make sure it's a fact packed guide that really delivered the goods. You want your customers emailing you pictures of Woofy showing you how beautiful she looks thanks to you and the guide you sold them. You can become successful and happy. Not just successful.