Hey, MD. Unless you want to spend a lot of money on features few will ever use, just get the 94169 at Harbor Freight. That will read and clear codes and comes with a disc of translations for the alphanumeric codes.
FWIW, you posted into the AMG forum, which doesn't apply to your car. Come visit us in the non-AMG 210 forum in the sedans section. Once there you will find scores of DIY and Help tips in stickies, plus lots of other information about your car.
Take care and enjoy the ride,