The truth is, you really havew to go and experiment with various products to find the one suited for you. Pumping
will get you some results, but think of the after effects; bloating, massive hypertrophy, etc. Jelqing will get you some results, but it will take extensive devotion to it. Plus, think of the method applied while doing it; 2 rubber rollers inside a metal cage, pulling on your penis and only creating the spring effect.
Now, for a more realistic and documented method, I highyl recommend the Jes-extender. It helped me tremendouslly after I lost some weight & wanted some inches back.
Here's the link;
http://www.jes-extender.dk/cms.ashx/
hope it gives to you a better insight.