The appearance of any well conditioned penis will be a very vascular rich and veiny penis, it will resemble a relief map. I started with your typical small, pink, smooth penis (this is no good), you have to develop the vascular components. In order to do this you have to move blood under pressure (jelqing) or statically (clamp), this expands blood tissue and creates large erections. So, it is always best to manipulate your penis with the chambers partially filled, I always start hanging in this state and the pressure of the hang creates a ballooning of the glans which helps head girth. As you hang the penis will go soft which is fine, the captured blood in the head usually stays due to the pressure created by the hanging apparatus.
Yes, you just grab the sack and stretch it big time, it is best to shave your sack to get the best grip and pain free stretch. It helps because the physiology of the sack and attachment to the underside of the penis affect erectile enlargement (blood source and resistance to enlarging). Other manual exercises stem around jelqing technique and targeted squeezes or uli’s. If you understand what makes you big, you can just do a couple elementary exercises and dispense with the rest of the garbage. I have never clamped because I believe hanging gives me the effects and the aggressive stricture of a clamp is better left for metalworking. That internal penis stretch is garbage.