Hi mundhra_5,
about the Nigeria buyer - Please Do not ship the product until you have the money in your hand. There is a good possibility that the user is fraud. You might find the following thread useful -
http://forums.ebay.in/thread.jspa?threadID=600001085
http://reviews.ebay.co.uk/SELLING-TO-NIGERIAN-BUYERS_W0QQugidZ10000000000712332
Even if the buyer has promised money via western union, still key is to ship only when you get the money in your hand.
Regards,
Sapana