10 flyers are required for one of the first quests with the Inquisitor.
To create them you will need several clean paper + 2 pen and ink. The paper is very easy to obtain at the beginning of the game, while the pen and ink require alchemy and are more difficult.
I suggest that you simply buy 2 bottles of ink and 6 feathers from the Astrologer. This will cost you about 4 silver coins and you will avoid headaches!
How to get clean paper
Collect skin at the morgue. Transform the skin into pigskin paper, then into clean paper.
How to get pen and ink
The easy way …
Buy 1 ink and 3 feathers from the Astrologer.
Simply turn them into 3 pen and ink afterwards with the church workbench!
The hard way …
Unravel the alchemy and build an alchemy workbench. Transform graphite powder or ashes into black paint. Then create your inks yourself!