Just about everything successful in life has a system attached to it. It is important to learn the systems needed for success as a professional speaker.
You cannot do everything yourself. There are multiple online resources to help you systematize your speaking business. Yes, it is a business and it is important that you treat it as such.
Learn the shortcuts you can employ that will enable you to organize and manage your business at low cost. Eventually you may need to hire an assistant however you can get started with a few internet resources that will make you look like big business.