To get big arms you should really work on your triceps because your triceps make 2/3 of your arms. To work your triceps you can do chair dips or skull crushers. And to work your biceps you can do...
By "getting big arms", I think you mean more muscle mass. To do this, you would want to spend an hour or two with a moderate or intense workout. Depending on how hard you worked, your poor body will...