Welcome! What kind of tank are you trying to setup (personality wise)? I'd try to make sure to keep central american cichlids with other central americans not South americans because of their difference in personalities. Generally CAs are more aggressive than SAs. Also the bigger the tank the better, just more to work with. Also make sure to research prior to buying any fish, that way you know what to expect.
As for types of fish you'll just have to look around to see what you like. Some of my favs are different species of earth eaters!