First of all, you will find a load of information about this and other aspects of the game on the:
Elvenar Wiki (click here)
• In order to buy Planks, you need to have a Trader*;
• To create Planks you will need to build a Planks Manufactory*;
• to collect Planks you will either need to:
- accept a trade offering Planks
OR
- collect the production of your Planks Manufactory.
* you will need to unlock the corresponding technologies in order to be able to build these buildings!
If you have any additional questions, please do not hesitate to ask!!!!
Other forum users and the Elvenar Team will be glad to help you