A sharp, pliers-style nail clipper is best as it allows the best control. Hold the paw firmly in one hand and use the other to trim the thick part of the nail until it ends just above the floor when placed flat on the ground. DO NOT trim up too high as this can break the skin and result in an infection. If you are going to care for your dog yourself, you will need a few basic supplies. Buy supplies designed for your dog's specific needs, such as coat length for brushes and combs or tinted shampoos if you want to bring out your dog's coloring.
Some people prefer to take their dogs to a professional groomer once a month.
This will cost more, but will ease your duties. Be sure to select a reputable groomer familiar with your breed of dog.