QML tutorial ?
Is there any book for QML ? What is the best way for learning QML ?
I'd suggest just "reading the docs":http://qt-project.org/doc/ available both inside QtCreator and on the Internet as well as implementing ideas of your own or borrowed from others. You might even go as far as trying to implement original Qt GUI applications with use of QML.
If you're for the game development, you might want to check "QUIt Coding work":http://quitcoding.com/?page=work. The source code is well prepared and described.