Where you begin training is important. Having too many toys and too much noise can make training difficult. Dogs do get affected by their enviorment.
Choosing the person who will work with the dog. Pick one person to direct the dog at first. As the dog begins to respond and learn the comands issued. A second person can be added. Make sure that who ever works with the dog is consistent with the traing technques used
Attitude is very important. A firm but kind voice should be used. Yelling will only bring fear. It will not create a cooperative behavior in your dog.
Looking at a dog as an individual will help during training. Some dogs learn quickly while others take time. Using love and patients will be rewarded by a well trained dog.
When working with a dog consider the breed. You may have some breeds that want to play a lot. Others like the german shepard are very easy to train. Find there strong points and develop them.
Using the correct training method is paramont. There are many methods out there. Each trainer has methods they use more than others. One method is using treats. The way you can decide what method is best for your dog is to try them and see which works best.
Do not try to work on many different behaviors. Focus one one at a time and you will be more sucessful.
Keep in mind the information I have given you. This information can help in encouraging your dog to listen and behave. Do not forget the most important part of the training. The part where you love and enjoy your dog.