To best house train your puppy, it is recommended that you purchase a small carrier or kennel that gives the puppy enough room to turn around.  This carrier will become the puppies "bedroom". 

While at work, away from home or unable to watch the puppy, place him in his room.  When able to watch the puppy, take the puppy outside after each meal and about every two hours. 

When the puppy is good, praise him.  As the puppy grows, he will be able to tell when he has to go outside, but until then, you must anticipate his needs.