Essentially, naruto finds an old decrepit(ancient/tattered/aged) book/scroll referencing how shendu made his talismans and creates his own. Methods, animals, powers are up to you to decide. However, the powers must relate to some attribute, myth, or symbolic meaning of the animal; fairy tales can be included in that (Ex. Frog based talisman could turn an animal into a humanoid form). No real upper or lower limit to number of talismans created (JCA had 12). Though fuuinjutsu is a must have for naruto, blood seals or fail safes to prevent others from using them. As for pairing/relationship(s) try to be original or at least an under used one, [ex. (While creepy or don't sit right with some people/fans) NarutoFem.Shino]. Other than that the story is your oyster.