Most design professionals agree it’s best to start with a rug and build the room up from there. It is far easier to pick fabrics and accessories based on a rug than choosing a rug after the fact.
Before visiting a rug showroom, make sure you know the minimum and maximum size of the rug you need. It’s also helpful to bring paint samples, fabrics, or even a pillow off the sofa. What style of rug are you looking for —traditional, contemporary, or transitional? It’s good to consult home furnishing magazines and bring in photos of styles you like.