you probably have only installed the Nokia Qt SDK ,beside that you also need to install Qt SDK ,which lies here .http://qt.nokia.com/downloads
prefer Offline installation,as it has maemo tool features than the online one .or perhaps you will have to get it later on .
further guys if you want to work through Qt .precisely get some help from here .http://qt.nokia.com/learning/online/...ation-creation
video tutorial regarding making an application might be handy for ya .