Need Help With A Healthier Lifestyle

Over the years I've gained quite a bit of weight. I injured my knee a few years back & it's still painful when I do to much with it. And I went thru a few years being depressed & had high anxiety unfortunately my coping mechanisms turned me into a very lazy, person with no motivation. For years all I did was eat & eat & eat, junk food at that. The reason for my post is to see if there is anyone who found a diet & exercise routine that worked for them? I work full time at a fast food restaurant (lucky me right? 🙄)