J.Y.
In Illinois you can care for up to three children including your own without a license. Advertising on care.com, craigslist, and sittercity as a home daycare always works for me. You could also answer ads for nannies via email and offer care I'm your home. I have also had success doing this. Other places to advertise are libraries and churches in your area.
You will be listed with CCR&R if you are licensed. People who are looking for a home daycare in your area will be given your information.