Just like Bryan Shawyer says, improve your diet, eat smaller portions, eat 5-6 smaller meals vs 2-3 large ones. Drink water throughout the day. Take your weight and divide by 2. This the amount of ounces you should drink. Also lift weights. low weight and high repeititons 10-15 of each exercise. Do walk/jogging and improve your jogging distance each week.
Start with fixing your diet. I started eating better and walked 3-5 miles a day at least 5-7 days plus weight training 4 times a week. Lost 77lbs over a few years. Walking will be easier on your joints until you get some weight off. I was 286lbs at 5’9” and did get down 209 lbs. I’ve been lazy and sitting at 220 right now.
Focus on nutrition and get an accurate TDEE. Your height is going to cause the number to go down but your maintenance calories is around 2300. Drop that down by 300-500 calories and hit those numbers. You don’t have to workout to lose weight. It’s mostly nutrition even a walk 20 min a day will help but get the nutrition figured out and I promise you will drop weigh