If you ever are the KH and you keep you capital at Sparte build a huge school there so they can become strong and smart.
personally I prefer to build the Big Academy in athens and Divide generals and governors at the start. Otherwise your Athenians and Rhodians are likely to get a lot of bad traits due to Government and failing the Agoge.
I do build a school in sparta at some point tho, can't be too bad to have generals that are able to govern a civy in times of need.