Made With Paper
For best results use an Adonit jot touch 2.
For paper rulers you can simply print from examples provided on the internet through google search for paper rulers or you can turn to your local hardware store who sometimes provide these FOC. IKEA make these available to customers.
Note that a4 slide & grip paper binders vary in size, you do not want to get one which will grip too hard to the iPad as this at times can result in sensitivity issues. For slide & grip paper binders simply search on the internet for “a4 slide and grip paper binders”.