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.