I dont know about cheat codes for gold edition but my favorite civs are the Germans,Chinese, Ottomans, Russians, and Austrians.
The Germans because their militrastic and scientific so cheap barracks are useful. They also have an awesome UU the Panzer.
The Chinese because thay have good traits that are perfect for a warmonger. Militrastic and Industrious cheap barracks and fast worker speeds. They also have a good UU the rider.
I like the Ottomans because of the Industrious trait and the Siphi is awesome.
I like the Russian because of the Cossak
The Austrians are like the chinese Militrastic and Industrious perfect for a warmonger and they have a good UU the Hussar.