Resources from the Industrial Complex, like wood, coal, platinum, etc., can be:

1. Sold at the Universal Cargo Port on the main island
2. Used to carry out resource processing contracts needed to complete orders at the Trade Port of the Industrial Complex
 
3. Used to send out goods for additional profit on airplanes from the New Airport in the main location. Normal cargo planes need to be at least level 4 before they can deliver resources. Heavy cargo planes can deliver resources from level 1.
Have fun playing the game!