Creating Habitats and Homes for Illinois Wildlife is a great resource.
https://pubsplus.illinois.edu/DNR01.html
Also check out: http://www.nwf.org/How-to-Help/Garden-for-Wildlife/Create-a-Habitat.aspx
For advice, you can contact the Illinois Department of Natural Resources district wildlife biologist in your area. Darryl Coates (217)-784-4730
Or the Illinois Extension Master Naturalist Program can help with guidance on what types of plants to grow and where to find sources for plants. http://web.extension.illinois.edu/mn/
Grand Prairie Friends will be having their annual native plant sale on May 10 in Urbana. http://grandprairiefriends.org/index.php
Have fun! And if you have other questions, please let me know.