Bench presses are a simple weighted exercise that you can do to work out your chest muscles. All gyms have bar weights for doing bench presses, but if you have one at home, you can do it there, or use dumb bells to replace a bar. Simply lay on your back on a weight platform and lift your arms into the air while holding the weight. Then lower your arms.
Proper exercise will require that you build up your stamina if you're overweight and relatively inactive. You can start to increase your stamina by working on your breathing techniques. When working out, you literally get "winded." Learn to take in more oxygen during your workout and you can increase your duration.
Make sure you know your limits for your age groups. If you are under the age of 40, you should try and stretch for about thirty seconds. If you are over the age of 40, then you should try and stretch for about 60 seconds to keep your flexibility.