How to learn to Play with Both Hands starting at Different Points by: David from www.piano-play-it.com
Hey David,
The Bach book inventions are great indeed for this purpose but these pieces are difficult for beginners.
If you'll visit the Piano Staff Lesson you'll see that at first we provide piano sheets where each hand plays apart, then we combine both hand together at the same time and later on each hand enter on a different spot.
It's a natural process that demand different motoric behvaiours and it takes some time. But start with the simple pieces from the Beginner Piano Music Page (starting from the musical rest area) and I suggest you then buy the Bastien - Classic Themes By the Masters Music Book which contains many great beginners pieces that work on exactly what you were looking for...