Awesome! Sometimes pond fishing is really great, like a box of chocolates, you never know what you're going to get.
As for the confusion caused by "bluegill" identification, you're probably better off calling them all bluegill! Around here we have longear sunfish, red breasted sunfish, bluegill, shellcracker, green sunfish, warmouth, rockbass and probably something else I'm forgetting. The problem is that most of these hybridize so easily that it can be quite a task to differentiate them as a singular species.
A good guide I found from TN is here: TWRA - Tennessee Wildlife Resources Agency - Sunfish Identification
It has several examples of each species and how the colors can be variable.