Referral Service business. Help people find businesses that can help them out. Business Overview If you're the one everybody in your circle calls for help when they're trying to find a good doctor, attorney, plumber or cleaning service, and if you love being on the phone, then a referral service could be the business for you. You can specialize in one area or several, depending on your preferences and the size of your town. You might run an attorney referral service,...