Teaching the command to sit could take a bit longer but this also is very basic dog training
. After you have mastered the "come" command, call your canine friend to you, place your hand on the end of its back, and say "sit" while gently pushing down on the backside. When puppy's bottom drops down to the ground, give a treat and lots of praise. In order to prolong the sitting position, merely delay the treat and the praise. Once seated, keep eye contact while delaying the time to bend down and give the treat.
Basic dog training is simple and very effective. It should also be fun for both you and your dog. It doesn't have to take hours every day. Even five 5 minutes consistently at a time will bring great obedience results. The rewards are great for you, and your dog's greatest pleasure - beside the treats - is to please its master.