Your customer is going to look for many things before settling into using your services regularly.  The most primary need is convenience, whether it was simple or difficult to have this job done.  Wherever possible make the trip to meet the customer instead of them having to come to your office.  Be prepared with all the materials that might be requested during the sale, including your samples and portfolio.  Be attentive and considerate of time, make the transaction as efficiently as possible.  Personally deliver the product when complete, and be as courteous of their time but making sure your delivered parcel gets to the correct person.

In producing the order, make sure that you are putting in your very best effort and are not just putting it together to satisfy the requirements of the printing contract.  Make every effort to have a completed product that is going to WOW your client when he receives it.  Compliment the customer on whatever use of images and content you were required to use and make them feel special.  Building up the customer in this way makes them proud of the materials you created and will support that pride in your work as they are distributed to their customers.

Never break a promise to a customer!  Deliver when due or even before, always include everything that was promised, and throw in a little something as a thank you.  Keep your appointments and be punctual, phone at the time you promise to return a call.  It is simple courtesy that makes a customer feel that you are considerate of their needs and worthy of doing their work.