First and foremost… anyone interested in exploring the use of digital signage needs to look at the DSE (Digital Signage Expo) website.
This website is loaded with great information. Attending the annual Digital Signage Expo (Las Vegas) is a great investment in you new digital signage endeavors. You will meet the vendors you will need to work with and see all the latest and best technology in one spot! I have attended this event and so have the folks I work with every day here at West Virginia University with the WVU Information Stations Network. I also suggest the Digital Signage Certified Expert Program (DSCE) for anyone serious about digital signage, especially those just now getting into this technology. It is an interesting course and can be completed in short order.
Reference materials… https://www.digitalsignageexpo.net/resources/referencematerials.aspx
Digital Signage Certified Expert Program (DSCE)… http://www.digitalsignageexpo.net/DigitalSignageExpo/PreConferenceEvents/DigitalSignageCertifiedExpertProgram.aspx