German Shepherd is a large size dog that originated in Germany. Few canines display the grace and majesty of the German shepherd. At a glance one can see that the strength and power that this breed possesses is obvious. Though the dog may appear menacing, especially to those up to no good, very few dogs are as easily trainable and loyal as the German shepherd.
German Shepherds are extremely smart, athletic and eager to please. These qualities make training them an easy task. 
Socialization: because German Shepherds have been bred specifically as police and working dogs for so many years it is crucial that you socialize your puppy with other dogs and people as early as possible once the immunization process is complete. Even before your puppy is vaccinated you can carry him along to places to socialize with people.
Crate Train Early: German Shepherd puppies are known to go through some radical teething behaviors and crate training your puppy will be essential to save your precious belongings and allow you peace of mind when you are away from home. Crate training is an essential tool and will make life easier for your dog while he is at the groomer, vet or at a boarding kennel and if he is accustomed to a crate at home he will adapt much easier to it when he sees one in other places.
Crate training also helps with dog toilet training and keeping your things as well as your puppy safe and out of harms way. Make sure that the crate that you get your puppy is big enough to grow in to.
In the beginning all puppies will scream and holler during the crate training process.
Their intelligence and desire to be with their pet parent will make them want to bark and whine till you allow him out of the crate. Do remember that if you do let him out of the crate when he barks or whines you will end up reinforcing this behavior and he will learn to use his voice against you.Be kind and consistent: make sure you are kind and consistent with your puppy!. Dogs such as German Shepherds will resist compulsion training by trying to defend themselves with their teeth. Remember this was a dog bred to take on criminals. This breed needs intelligent training methods such as positive reinforcement
Establishing order: when a puppy is introduced in to a new home it has to go through a period of adjustment. Within the first few weeks of bringing the puppy home you should have been able to establish a set of consistent rules for him, thereby establishing his position in the pack structure (your family) where you are the alpha. Please do not resort to "alpha roll overs/ pin downs" which is an outdated training method that is capable of turning even a temperamentally sound puppy in to a nervous or aggressive dog in the future.
So before the puppy comes home decide where he will sleep, where will he eat, will he be allowed in all rooms of the house, and decide what kind of relationship will work for you and your family
Play the right games: teach him games of fetch where he learns to bring back his toy to you on command. Do not engage in games such as tug of war especially in a household with children. Even if you must engage in this game do not win this game by physical force for might is right applies in the animal kingdom. As he may loose in this game with you while he is a pup but may not hold true when he turn in to a full fledged adult German Shepherd. If you must play this game win on a "leave it" command rather than with physical force.
Pack structure: here are some pointers to establish it. It is best not to allow your puppy on furniture and beds as this is a place reserved for your family and you but then again if your comfortable with allowing him access and he behaves himself and does not try to assert his dominance over you.
Dog toys are for fun and playtimes, however they are YOUR toys, after a game take the toys away, your dog will soon begin to look forward to playing with your toys. Leaving toys with your puppy can sometimes create an issue of dominance or possession aggression.
Feed your dog after you have eaten as in a pack structure the alpha eats first. Also make your pup earn his meals by asking him to do a sit for you before you put down his bowl.
Daily dog grooming is a must, not just because he needs it but also because it establishes you as the alpha in the pack, improves blood circulation and increases bonding between the both of you.by doing this you are also conditioning him to all kinds of handling making it easier for people such as veterinarians and groomers to examine your dog
When going through doors or down stairs your dog should allow you first. A lot of dogs push their way out of the house or down the stairs before you. If this is the scenario you must habituate the pup to do a sit and stay for you and allowing you to go first
Training commands: these are some commands that you must teach your dog such as heel, sit, stay, recall, fetch, quiet/speak, leave/hold etc.
Your dog should be trained to voice command and praise which will be enough reward for him if the both of you get the technique right. Keep training sessions short and make it a fun filled experience that both you and your puppy should look forward too.