May want to do strength before cardio. I started this recently. Used to do cardio first. Noticed changing the order up gives more energy toward cardio event.
You're apparently not too used to working out, so you have to start slowly and build up as you get stronger. Anything that gets/keeps you moving is doing something for you.
While cardio is good for you, you also need to do some strength training. You can do that in the form of squats, lunges, or using light weights. You can check out YouTube for various weigh bearing exercises. When you do strength training, you build muscle, and muscle burns fat.
Toning exercises help tone your muscles, but they won't do a lot for your skin. Losing weight slowly is the best way to avoid the lose skin that often comes with losing a lot of weight, because it gives your skin a chance to "shrink" with the rest of your body. There may be some lotions/creams you can try that might help tighten your skin, but there's no guarantee on that.