I posted some Shelby Township specific notes on another thread that may be helpful in general for those starting a petition:
https://www.backyardchickens.com/t/657776/how-to-get-chicken-laws-changed-in-shelby-township-mi/10
https://www.backyardchickens.com/t/657776/how-to-get-chicken-laws-changed-in-shelby-township-mi/10