Each state has its quirks and specifics. Basic resources for IL social work licensing can be found at the NASW-Illinois site, at SocialWorkLicensure.org, and, of course, from the gov itself, the State of Illinois Department of Financial and Professional Regulation.
Don't let yourself get overwhelmed as you start the process to becoming a social worker! It's doable. There are lots and lots of people who have made it through the process. Consult with them. Learn from their look-back-and-laugh stories, get focused, and get licensed! Good luck!