Is there any other advice you can give me?

Nigeria is a country that requires considerable effort even when working through a local partner, and it may require additional resources. The key is to be well prepared, to study the market carefully and to realise that it will take patience to become fully established. Please do contact the Embassy in advance of your visit for advice as there have been occasions where companies have got into difficulties, predominantly regarding payment. You can also visit the federal government trade hub which has useful information, including a duty calculator.