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.  We strongly recommend washable pads over disposable (they are far more cost effective, they wash well, and they stay in place better - the puppies like to play with and tear up the disposables), 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, we were burning through the wee wee pads.  I found this economical and environmentally friendly alternative...human bed liners.  I buy the multi packs so that I always have some clean ones.  They launder beautifully.  I also find these MUCH easier than the grass doggy patches which are not fun to wash.  These are the ones we recommend to encourage them for potty area.  The others below are good for crate and playpen lining, under food bowls and to protect car seats.

NOTE:  Some people swear by the grass patches for puppies, but I have found them to be not fun to clean.  I much prefer these.