A friendly hello when you walk in and then let you browse and not be followed like you are going to steal the bolt and run. Ask what type of classes people would like. Have a variety of fabric, not just brights or reproductions, but a good mixture unless you specialize in one type then that will limit your customer base. someone willing to answer questions if you have problems. Open sew time. Maybe a punch card for a free amount after spending so much.
good luck to you