The Illinois Green Business Alliance is a great resource to get your business on a sustainable track.
Use the IGBA 3-Step process to start greening your business.
http://www.illinoisgba.org/GetGreen/CertificationProgram.aspx
Other Resources:
http://www.igencc.org/
http://www.sbmarketingtools.com/green-marketing-ideas-to-promote-eco-friendly-small-businesses/
https://ilcleanjobs.org/
https://born2invest.com/articles/new-companies-eco-friendly-strategies/