Hi cskalyan,
In order to ship internationally, you may like to have a look at the workshop that UPS conducted on the boards. This may give you some ideas on international shipping.
http://forums.ebay.in/thread.jspa?threadID=100001161
However, since you need to ship to Nigeria, I will also request you to go through the following thread, since some of our users are getting fraud orders from Nigeria.
http://forums.ebay.in/thread.jspa?threadID=300001227
Regards,
Sapana
Community Development Team