Secondly you can't add a local bank account / debit card in Nigeria. You can only link a credit card.
Also the option to receive paypal payments is sadly not available in Nigeria. You can only send payments for purchases funded by your (confirmed) credit card..... AS LONG AS YOU ARE USING A NIGERIAN PAYPAL ACCOUNT.
Paypal varies a lot country to country and can only offer the services that the banks / governments of that country allow it to offer. There are quite a few countries unable to receive paypal payments.