I need a web site with dogs for sale?

Try petfinder.com.

There are many good dog breeds, but the best is one that matches your lifestyle. If you are an active person, you'll want a dog that can keep up with your energy level. On the opposite end of the spectrum, if you're not active for whatever reason, you'll want a less-active dog. There are several other qualities you'll also want to consider. (Amount of grooming, for example, or how much training experience the breed requires.)

So a "good" dog breed is subjective; it depends on you. A good place to start would be at a shelter because you can tell the shelter employees a little about yourself, what your daily schedule is like, and how much experience you have with owning a dog. With this information and they information the collect from caring for the animals, they can help you determine if a particular dog is right for you.