Myself, I shuffle till I feel the question is really in the deck - I concentrate on my question till it loses focus, then I stop shuffling! (as in, the very second my mind wanders off from the question, I stop). I then cut my deck into three piles with the left hand (the hand of the heart) and to me, the furthest pile to the left has to do with the past, the middle is the present, and the third pile is the future.
So, I restack the deck with whichever pack is relevant to my question on the top - so if what I am asking has its roots in the past, the one furthest left goes on top; and if it is about something in the present, I put the middle pack on top, etc.
But in the end, you have to do things the way that feels right to
you you will evolve your own rituals, that feel natural to you! This happens over time, and with practice.