Jamie:

Your marriage certificate is from IL.   This makes things easier because you will just send 2 certified copies of your birth certificate to IL Secy of State, together with the other (green) documents. 

Remember, you need to order 4 certified copies in total, 2 of these will be for the dossier. 

Since these are issued by the state, you don’t need to do anything to them, like notary or oath.  Just send them.