Werewolves of the past were created 1 of 2 ways.
Bites weren’t a part of this either.
A person could choose to become a werewolf and search for a witch to perform the required spells.
Or a witch could curse someone to become a werewolf.
There are spells, chants, potions and special rituals that can change (or force) someone to become a werewolf. Various spells or incantations along with recipes for or ointments can be found in very old witchcraft books.