There are no procedures - just buy from a sword shop, or buy online. There is no law against owning an antique sword. The sword must be registered. Any sword from a shop will already be registered, so the purchaser doesn't have to do anything but buy the sword. It is not illegal to own an antique sword in Japan. Swords from the war are not considered antiques or "art swords", and are classified as weapons, and these swords are not allowed to be owned or bought/sold, unless they were made by traditional methods using traditional materials. In other words, factory-made swords are not allowed to be owned. But the rules on this are becoming very lax. You often find WW2-era factory-made swords for sale on the internet. (These are generally looked down upon by sword aficionados.) This is why the sword book you got is essential, because it should point you to quality swords.