First of all, to create suspense you need:
Some background information.
But incomplete knowledge.
That is, from the beginning the author needs to already have something set up—to let the reader know something about a character and their situation, or the suspense won’t happen—you have to care what happens for suspense to occur in the reader’s mind.
read more : http://writerunboxed.com/2011/06/15/on-the-edge-of-your-seat-creating-suspense