Firstly, your arms are, to put it in the politest way, not good enough for MMA, or any sort of fighting. You need to hit the gym and get a set workout off a website for biceps, triceps and chest mainly.
Secondly, you need to get on a treadmill and work off that belly and bitchtits. But you also need to eat healthier. Get a fat burning diet off somewhere, google around, I'm no professional at that so I can't give you advice on what exactly to eat. But I know that you need to eat something, so don't think that because you don't eat you'll lose fat. You'll also lose strength and have no energy.
Thirdly, you NEED to join the MMA center. It will get you into shape a hell of a lot quicker than if you don't, and whilst you are toning your body up and getting strong enough and back in shape, you will be able to learn all the techniques. It's hard at first but you'll get used to it. It's good for cardio too.
Hope I've helped.
UK-MMA - A Mixed Martial Arts Community
Mauricio Shogun Rua
Liverpool Football Club Forever