What happens next?

How to fan cards
Hold the deck of cards loosely between your left thumb and fingers.
Put your left hand out as though you were holding a cup of water, with your thumb nearest you. Place the deck of cards in between your thumb and index finger, keeping it flat with the face side down.
Place your index and middle finger against the underside of the deck. The tip of your middle finger should be against the near right corner of the deck, with your index finger alongside it.