Not the best business advice, but what I have learned through being employed by businesses:
Give conflicting advice every time you open your mouth. Confuse the h@ll out of the employees to keep them under control. Dangle the carrot and yank it away when someone gets too close. Never admit, in front of a witness, what your subordinate knows to be true. Accuse others of failure, rather than admit mistakes to self, in order to keep your job. Lie, cheat, steal, manipulate others - everyone else does.
Start with nothing! That way you lose nothing. If you already have something - protect it with every bone in your body. Know when to give up. Know when not to give up. Expect to work 16 hours a day 7 days a week. Have nerves of steel. Develop a skin as thick as a rhinocerus Get yourself a second in command as nuts as your are.
It is on of the cost effective and directly works on achieving results for your business. Business advice is one of the most powerful ways of developing your business by maximising all areas of performance.