You will need the parents Akc numbers and names. Go to the AKC.org website, and you can register the litter online under Registration. The papers will come in the mail.
You'll need the parent's papers for a start. Once you can prove their lineage, getting papers for the pups is relatively easy. Just get in touch with your local breed society and register them.
My Yorkie had five pups on the 19th of January. The mama and the dad of the pups are AKC registered. How do I get papers for my pups.