You forgot to tell him to make sure not to get it confused with The New 52, DC's reboot from a few years ago, or even explain what the hell 52 is. >>6949884
52 is the lead-in event to Final Crisis, DC's third major Crisis event (the first being Crisis on Infinite Earths in the 80s and the second being Infinite Crisis in the early 00s). They're good in their own right, but not necessary to 52 and Final Crisis (you do need to read those as a pair to get the full story).
Also, if it's the artwork that caught your eye, the guy's name is Alex Ross. He's done some amazing covers for DC over the years, but he also illustrated the entire run of their mini-event Kingdom Come. I would highly recommend that as well. It's an elseworlds story so there's no prior reading required, and it's only 4 issues.