What I know so far about paper ninjutsu is
+ its the art of using various paper forms such as paper plane, paper shuriken and different types of paper folds that I can't recall their name right now to do battle, by battle I mean to using the paper to damage, maim or disable. A unique feature of paper ninjutsu that I note is that it rarely make use of hand seals or gestures thus making it hard for the opponent to deduce what the user will do next, another feature is that the control of the paper is limitless, the paper can bend to the will and thoughts of the user
+ the system behind the paper control isn't well defined to my best of knowledge, according to naruto wiki it simply state that its the infusing of the user's chakra onto the paper but it doesn't explain how the user can change themselves into paper as well.
+ there is only one known user of this technique and that's konan of the akatsuki
This is the depth of knowledge I have on paper ninjutsu, hope it is enough?