First figure out what target platform you want. This might help you: Qt Creator Tutorial P1 - Introduction.
This tutorial will help you deploy applications on Android with QML and C++. The tutorial is designed for a Windows development environment. An Android device is required.
Qt Creator Android Tutorial A1 - Install
This tutorial is about Qt Widgets and C++ on GNU/Linux. The tutorial is not specific to any GNU/Linux distribution.
Qt Creator GNU/Linux Tutorial L1 - First Project