Become a limo driver in chicago?

I have been in retail sales for over a decade and would like to drive a limo in Chicago and surrounding suburbs. I believe driving a limo will be fun and exciting, because everyday will be different. From what I have learned so far, I don't need any special, unless I plan to pick up and drop off in Chicago. How do I get into the business? Should I invest in the "Limousine Training" course at Harold Washington college? All help and feedback will be appreciated.