What do I an American Citizen need to do to bring a fiancé from Ghana Africa into the USA to marry.

WARNING, this is a classic SCAM designed to simply separate you from your hard earned money.

You might have to sponsor her. When she applies for a Visa, she would list you as a sponsor. Other than that you need do nothing nor pay anything. But you are aware, as Ben warned, that Ghana is notorious for this scam.