While most people have a goal to focus on their career (aka employment), there are others who think to be on the other side of the fence: the employer. To own a business is not easy. You have to know the ropes so that you will lessen the mistakes you commit. A plan is important. You may have the capital but if your money is used unwisely you just might find yourself sinking into bankruptcy.
If you want sure earners, think of sure needs. Food is one of the top 3 needs of anyone. A catering service will surely make you money as long as you have your catering equipment supplies, the people who will help you, and the clients, of course.