It's personal preference, but here goes. Lets assume you done all the teasing provoking and general getting him fired up enough to turn of the football and you're getting down to action. Play with it, stroke it (silky, isn't it) and let him know you're enjoying yourself. You're hafway there already.
Remember that the most sensitive bits are near the glans, so that's where you'll need to concentrate. So if you can't swallow to the pit of your stomach, don't worry. Concnetrate on the plum and you'll be appreciated. Your hands are as important as your mouth. Try cupping his balls with one hand and wank him with the other, sucking and kissing the head all the time.
As he gets really excited trying holding the skin back gently; from that position pull the skin back further so it's tight. That pulls on all the little nerve endings around the base of the glans. Now give it a twist to tighten up even further - not more than quarter of a turn! A repeat dose as required.