Hey man. Let me give you some encouragement. Good job on deciding to make a change. It’ll be a bit of a shock to your brain at first, since you’ll be making such a big change in dietary intake. But with enough determination, you’ll be able to do it. Simply think of this as a means to an end. Think of what the end results can be, and let that be your motivation.
I am a 5’ 11" male and years ago I had weighed 277 lbs at my max. I was able to get all the way down to 185, but my weight creeped back up to around 215. I am currently aiming to get down to around the 195 - 200 lb range, which will make me happy.
A lot of my weight loss was/is accomplished via changes in eating plus exercise. There is really no exercise that will prevent the loose skin on the mid section. I have the stretch marks and a little bit of saggy skin. But it’s very minor. Unless your starting weight was > 350 lbs, any loose skin will probably be barely noticeable. Skin is fairly elastic.
Studies show that people lose weight with both cardiovascular and strength training, so do whichever you find the most fun. I ride my bike, walk/jog, rowing machine, and kettlebells.
In general, it’s all about insulin resistance. By eating less sugar and increasing physical activity, you reduce insulin resistance (or improve insulin sensitivity, which is another way to say it) and will then lose visceral body fat. Doing all meals via Huel will give you about 5 to 6 grams of sugar per day, very low by modern day standards. Then, just pick your favorite physical activity for 30 - 60 minutes, 5 to 7 days per week. Give it time and that should work.