A customer newsletter. Successful businesses, both large and small, have been using newsletters to build customer loyalty and advertise their products and services for years. If not, you need one.
Customer newsletters are easy to create and distribute.
All you need is a one-page newsletter with at least one article of interest to your customers. The rest of the space in your newsletter can be used to advertise your products or service. Here's an example, suppose I am a beautician who recently opened my own shop. In order to get new customers, I write a one-page newsletter. I include a brief article on keeping hair healthy with conditioner - with directions on how to do it.