I personally have the newest iPad and between Google Docs and the pre-installed Document Sharing apps installed on it, I'm virtually paperless. Hope that's helpful! If you have any other questions feel free to send me a message and connect.
@David Maradiaga Same, although I use Microsoft OneDrive and the office apps. I put everything in there: a folder for each property, sub folders for original listing, signed contract and closing documents, leases, property bills...
I bought a duplex scanner with a document feeder so when I get paper I drop it in, scan, then shred the paper.
I was using spreadsheets for expenses and revenue but recently switched to QuickBooks Online.