Here is a great blog for all information about being in a Coop as well as anything you want to know about Big Farm.
You will find answers to questions about projects, research, and collectibles as well as how a Coop works and benefits you, along with more helpful information about the game to help you succeed!
Follow this simple link and become the farmer you always wanted to be!
http://bigfarmtips.wordpress.com/faq/
May the force be with you!