Disposable wee wee pads are useful for puppy house training or any time you will be leaving your dog inside longer than usual. Be careful that they don't get too used to wee wee pads versus the great outdoors though. I recommend washable pads over disposable, but disposable are far better than the old system of sloppy wet newspapers! Bulk boxes are more economical than 10 to 20 packs.
Remember that your puppy is still growing. When you pick up your puppy, they should be good going out every two to three hours during the day. You can slowly work to extend this time. Getting them out the door quickly first thing in the morning is important. Then try to stick to a predictable schedule as they get used to the routine.
Caring for litters of puppies, I was burning through the wee wee pads. I found this economical and environmentally friendly alternative...human bed liners. I guy the four packs so that I always have some clean ones. They launder beautifully. I find these MUCH easier too than the grass doggy patches.