Increased Bone Mineral Density
Reduced Body Fat
Improve Heart Condition
Increase Quality of Sleep
I always advise that you consult your doctor before beginning any type of exercise program/resistance training. This goes especially for people who have medical conditions or are overweight. This kind of training is not something that you should explore on your own. Hire a personal trainer to help you get started on the right track. A trainer will design a program appropriate to your physical condition and goals. As mentioned before, find the trainer that specializes with your particular goals in mind.
On a final note, the key to resistance training is to simply take your time. Do things one step at a time, correctly. As your body condition improves, then move on to more challenging tasks.