Regarding which countries to export to - there is a 2014 report on steel as well as copper. Based on my research the countries with highest steel imports are US,EU,Germany,South-Korea and Italy. Also highest importers for Copper are China, Japan,South-Korea,Spain and Germany. You might also be interested in countries with fastest growing imports of copper - which are Georgia, Russia, Malaysia, Netherlands and Namibia. The mode of payment most widely used is Letter of Credit.