Hi,
you might want to have a look at http://code.google.com/p/qextserialport/
This is a Qt extension library to access the serial port on Windows and Unix.
Basically your steps will be the same as with any Qt application: You can define the UI with QtCreator, and then implement the behavior in C++ by connecting signals to slots - the qextserialport library provides a couple of signals which you can use to react on data received from the serial port. In any case, if you are really new to Qt, you should definitely start with working through one of the many tutorials available on the net - start with implementing a small demo application, and add the serial communication once you are more comfortable with Qt.
If you have questions specifically on qextserialport, I might be able to help - I am using it in a current project.
Thanks,
Andreas
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