A great resource to get you started on native/pollinator plants is Xerces society. They have two plant guides for your area: https://xerces.org/publications/plant-lists/monarch-nectar-plants-midwest and https://xerces.org/publications/plant-lists/native-plants-for-pollinators-and-beneficial-insects-midwest. You can cross-reference these guides with the USDA Plants database (linked above) which has county-level data (zoom way in on the map) if you only want to plant species native to your county.

It can be difficult to find some native plant species at nurseries, in which case I source seeds online and plant those instead. Sometimes they don't work out (poor germination) but seeds are so much cheaper than buying plant starts so it's still more frugal even if half of the species you buy are unable to germinate. It's best to source seed as locally as possible (a company based in Chicagoland, or at least WI, IL, or IN).