OP, as others have asked, are these "bat wings" due to massive weight loss and having extra skin, or are they due to being overweight?
If it's the former, there's not a ton you can do besides plastic surgery. You could do some tricep work and fill it in some but it likely won't go completely away. Depending on your age and some other factors, your skin may have some elasticity and some of it could shrink over time.
If it's due to being overweight, it does not work that way where you just "target" or "tone" your arms...or abs...or whatever. You work on your overall health and you'll loose fat wherever your body is storing it. Find a good basic solid nutrition plan. It should include the proper balance of protein, carbs and fats. Stay away from the "fad" diets. Carbs and fats are not evil, in fact your body needs them. Just eat them in moderation and eat the right ones. As for exercise, tons of good programs out there. Doing all cardio is not the way to go...at all. Find a good weight training program, and you can add some cardio in. For a beginner, I think a simple 5x5 routine is a great way to start. Just Google "5x5 workout" and you'll get bombarded with ideas.