Simple tracking tool -
www.killscreentime.com
It's FREE and anonymous, but most importantly, you can see how others progress every day.
This last part is a powerful motivational feature. You won't feel alone when battling the mountain that lies ahead.
Best of luck! If you have any questions, just reply in this thread, and I'll answer your Q's.
(Keep in mind that while quitting games is definitely helpful, the goal is to reduce screen time in general - i.e. watching TV/using smartphones/etc.)