You definitely need a license to do ANY mortgage business in IL.
And good luck with that, IL is VERY restrictive, so much so that alot of Mortgage brokers have stopped doing loans there.

First check with your state in case they DO have any legal requirements such as a license. Otherwise, with my experience, you do not need to have any kind of formal training to be hired by a company as a broker. I did it for a little bit, but it was my degree in Finance that helped me get in the door. Your background may suffice as enough experience to get you hired by a brokerage company.

don’t no about your state but in south carolina you have to take classes at the technical collage and then when you feel you are ready you have to pass the state board of Realtors