What do I need to get a visa as a Nigerian residing in Ghana.......

As you are going to China for business purpose, you need to apply for a China business visa ( F visa). You need to collect the following requirements to apply for the visa from China embassy in Ghana: "invitation letter from duly authorized China unit or confirmation letter of invitation ( you need assistance from your inviting company in China to obtain it); your passport and one recent passport photo; completed visa application forms V2011A and V2011B; your Ghana resident card; other deemed necessary documents by the embassy.