This a fairly easy one,but one tip-use good,high quality cards as they are much smoother than cheap cards and are well worth the investment. Go to Elussionist.com or just search google for some bicycle red backs,blue backs,black tigers or ghosts!(There are other makes but I prefer bicycle)
Step 1: The Grip
Hold the cards like it is shown in picture one.Keep the grip fairly loose and it helps if you have your cards on a grippy surface(a rug works well,or,if you could get a card mat but they are quite expensive).