Congrats! With your tank size (80 gallons) you will have plenty of room for much-needed rockwork and for each fish to have his/her own territory. As others have said, Mbunas are some of the few fish you can actually slightly squish together in a tank. BUT start out with a few, try to get male and female pairs of all. The reason why I say start out with a few males and females is because they breed prolifically. They will quickly fill up your tank, you may get a few generations of fish which would be really cool.
Also if you want some inspiration for making your aquascape for your new tank (assuming you are doing an aquascape), check out these YouTubers: KGTropicals, Tazawa Tanks, and Cichlid Bros. They are all great sources for info on cichlids in general but especially African cichlids. Also, KGTropical's John did an EPIC rockscape for his colony of Yellow Lab Mbunas. His rockscape in his massive tank has been a source of inspiration for me ever since I saw it.
Also if you want some inspiration for making your aquascape for your new tank (assuming you are doing an aquascape), check out these YouTubers: KGTropicals, Tazawa Tanks, and Cichlid Bros. They are all great sources for info on cichlids in general but especially African cichlids. Also, KGTropical's John did an EPIC rockscape for his colony of Yellow Lab Mbunas. His rockscape in his massive tank has been a source of inspiration for me ever since I saw it.