Would also start stocking up on used newspapers. With a litter of puppies you will need them once they start to move round and you start to train them to go outside. You start off with papers covering an extended area and gradually reduce it as the puppies learn to pee and poo on the paper and then you gradually move the paper closer and closer to the door and then they learn to do outside. They're be accidents but do learn. Regarding the blankets I know a friend of mine bought a number of 2nd hand baby blankets on EBay which worked perfectly when she had her new puppy - lovely and soft! Play pen would be a good idea to keep them contained but also give them a little room to stumble round in.

Best of luck. Puppies are lovely though is hard work in the begining.