Always make sure there is and will be enough cash in the bank.
Period. The most common business-failure mode, hands down, is running out of cash.
Listen to your customers.
It boggles my mind how little most entrepreneurs value their customers when, not only are their feedback and input among the most critical information they will ever learn, but their repeat business is the easiest business to get.
Trust your gut when it comes to your business it's a extremely valuable resource when it comes to decision making
Know your finances in and out. This is very important with knowing your money
Learn to say yes and no a lot this is very important.
Understand the risk and reward. You could lose everything or you could make a great living
Make a plan but be successful
Keep your sense of humor. No matter how much money you make always remember to laugh