Yes I am rather new too mining but I am decently tech savvy.
Thanks in advance!
With buying only thing you might need to do is change network info along with the pool info others mentioned. It varies greatly how sellers do it on selling gear with used. I always included a piece of paper with IP address to make buyer's life easy and mine easy as less support when installed.
But if good seller they will either set it on DHCP, or they will send with static IP and tell you it. If you have to reset them then it chances are will need to be 1 by 1 and set to different IP's.