Whatever works for you. I can tell you the way I do it. I have the person sit next to me so they have the same view of the cards that I do. I talk to them about how the reading will work, that I'm not psychic - there aren't any spirit guides or dead people. Then we talk about the question - sometimes I begin with a general reading and then do a couple of further, more specific readings. I shuffle the cards thoroughly and get the client to cut them with their non-dominant hand. Then I take the cards back and lay them down in whatever spread I decided to use. Normally, I'd be using tarot cards, not playing cards, so I would quickly point out any significant cards/patterns and then interpret each one individually and as part of the whole.