Programming, especially for games, isn't "Simple & Easy". If you're really interested in making this product, do what people said. Check samples and learn how to do it.
Noone in their right mind will tell you exactly how to make it. Or else, We would make it and sell it ourself.
Libraries like Cocos2d can help you make it more simple graphic wise, but you still need to come up with the logic behind your idea.
Here are a couple excellent books to get you started:
-Programming in Objective-C 2.0
-Beginning iPhone development
I'd read them in that order.
Good luck.