Puppies urinate frequently. I timed one of my puppies once, eleven minutes between puddles. You will have to be vigilant at first until he gets the idea that this potty business is meant to be done outside. There will be times when you are distracted and puppy makes a puddle. He is just a baby, do not expect perfection. There WILL be a few puddles, it is not the end of the world. Clean the puddle and take him ouside to remind him where you want him to go.
One of the best tools for housetraining (and for saving your sanity and carpets), is the crate. Crates are not inhumane. It will be your puppy's oasis, his own portable den. After puppy has been fed, pottied, and played with; place him in his crate for some quiet time. Puppies nap a lot when very young. Puppy will not wish to soil his own den. If, however, puppy is left in his crate for too long a period, he will have no other choice but to mess his bed. It is up to you to release him at regular, humane intervals. When puppy wakes from his nap, take him out for another potty session, and once again praise him when he performs.
Puppy does not need free access to the entire house. Restrict his activities to one room, preferably one with a tile floor. Puppy proof the room, anything left on the floor is fair game. Puppy is anxious to please you, soon he will figure out that outdoors is where you want him to eliminate and he will begin to ask you to let him out. He might sit quietly by the door and if you do not notice him, he may make a puddle. He may be playing too hard to notice he has to go until it is too late. Puppies do not have good bowel and bladder control until about 5 1/2 months of age. Give him credit for trying. Do not rub your puppy's nose in his mess or whack him with a newspaper. This is a normal body function, you can't expect him to hold it forever. There are dogs so afraid of making a mistake that they become seriously constipated. If you find a mess, simply say, "No, no. Bad potty." Take him outside and praise him when he gets it right. Some trainers recommend that you not clean up your puppy's mess while he is watching.
I am not going to kid you, raising a puppy is a lot of work. But, a job worth doing, is worth doing well. If you are vigilant and consistent, your puppy will potty train quickly and reliably.