Scrying is one of those skills that comes with time. The basics, as with many other skills, are required to properly develop this. There is an article, either here or somewhere similar, that describes the art of scrying as a focused "unfocussing" of the eyes. Upon gazing properly at your medium of choice, images may bring themselves to your attention. Many see the act of this manifestation as a grey cloud of fluid energy, twisting and turning to appeal to your third eye, or imagination, sending your subconscious mind what it wishes to see. I can't stress enough how much personal time and effort must go into a skill like this, in order for it to be of good use.. Meditate on this.. meditate, meditate.. then meditate some more.