Marriage

Please, how do I go about marrying a Ghanian lady or do court marriage as a Nigerian in Ghana

You both need passports or birth certificates. Then, if you are in Accra, go to the Registry Office in Ministries and register a time for the wedding. Not sure how much it costs now.
Then turn up at the time for the wedding with 2 or 3 witnesses and you will be married and get a marriage certificate