I'm reading a very good, helpful book on my iPad [it was created in iBooks Author] - it's also available in other formats: "Paperless" by David Sparks. He also does a podcast, MacPowerUsers and was covering the topic of going paperless there and I decided to get the book and study it...as I'm trying to automate and cut down on the paper in my office.
It's about $10 = it was a wise expenditure frankly. He discusses different OCR apps for Mac and iOS and their use, and right now I'm into the chapter on Process - moving from the haphazard.
I haven't finished the book but it's been helpful to me, even only half way into the book.