HELP -( piano) - HOW DO I KNOW WHAT NOTES TO PLAY ?: S eg a c...WHAT C?: S?

help...on the staves - treble and bass clefs - where is the middle c? because in my piano for dummies book it had easy but challenging songs) and all the notes are ON THE STAVE- but on the cd they dont sound really high? - they sound normal(eg in the middle: S