FHIman,
I'm also in the Chicago area. I have over a dozen tanks of North American Natives.
It's really hard to recommend a start fish without knowing what kind of fish interests you.
If you're looking for a colorful and moderately aggressive sunfish.....Longears are the obvious choice. If you want a mild mannered local sunfish, Orangespotted sunfish are a good choice. Pumkinseeds are around as well but don't have half of the color that longears do.
Pickerel are hard to keep with others but also locally available.
On the minnow front....SRBD are true jewels and almost impossible to kill. Red shiners are a little drive west but worth it. Redfin shiners are a great fish but don't hold color all that long and Spotfin shiners are abundant.
We have tadpole madtoms that are also impossible to kill as well as black bullheads (but the bullheads get big and eat big things).
If you're looking to get in the water just let me know. I'm out all the time.