While there are some decent products in the stores out there, most hair salon stylists will caution you to stay away from most store-bought hair care products. The very best products are usually for sale only in hair and beauty salons and spas.
Some hair salons will offer you both face shape and hairstyle evaluations -- some for a fee, some for free. Since face shape and hair type is an important determiner of what hairstyle would look best on you, it's a good idea to take advantage of such a service when you find it.