I'm presuming (This is just a guess), you were charged with a misdemeanor - if so, realize that in Cook County there is no "vetting" process. The State's Attorney doesn't see your charge sheet until you get into court; generally that's when the vetting occurs, AFTER you get to court. Gotta love Chicago.
First, you get a public defender if you can't afford one. If you can afford an attorney, consider contacting your local bar for a list of attorney's that concentrate in criminal law.
You are facing criminal charges with the possibility of imprisonment and fines.
I urge you to contact a criminal defense attorney.
If you cannot afford one then I would follow the advice of Mr. Gotzh, and petition for a Public Defender if you meet the income guidelines.