Marketing is an equal blend of art, science, business and patience with a strong commitment to a plan. Yes, you need a plan. If you don't have a plan, you cannot get anything done, because you don't know what needs to be done or how to do it. The essence of planning is to study the past to decide in the present what to do in the future. If you don't know where you are going, then any road will take you there.
To take better care about your business you need to learn more about marketing. Knowledge is more than information, knowledge is the source of power. You can't manage what you don't know.