Did you major in a subject like English, history, or math in college, or do exceptionally well on the SAT exam? Do you have patience with children? If so, you likely have what you need to tutor kids in particular subjects. Seek out parents or teachers and let them know that you tutor students in a certain subject, and offer materials for them to share, and phone calls will often trickle in. You can get going locally or expand across the country by offering to tutor online.