Hi, for the cost of a china visa, you can visit the page for details:
https://www.travelchinaguide.com/embassy/ghana.htm

For the guidelines of visa applications, you can refer to:
https://www.travelchinaguide.com/embassy/visa.htm

As for the ticket cost, it is hard to say, since the airfare always changes for international flights. Thus, you would better consult the local booking agencies and generally you can get better airfare there.