Customers are always right but they always seek for the right place to transact business as well as get their needs. One very thing about first impression walks well with customers as they love a place where they can familiarize themselves with. You do not know what a simple "Welcome" can do when it comes to customer relationship.
When you get a new customer, if it is possible to ring a bell, you can do that, a simple ringing of bell and cheering of new customers make feel special. Also, providing incentives for them so as to make them return and reorder is a great impact which will make them always comeback.
For established customers who have been patronising you, you can create a loyalty program and reward for them, making them know how dear they are to the organization.
Always make the customer’s experience as easy and enjoyable as possible when in your organization, Never forget that customers are always right unless the say otherwise. Also always reassure customers of good products and services that will always meet their needs. Also create a great feedback technique so you can always improve as you grow.