Ubuntu SDK is a powerful IDE based on QtCreator, which provides all tools required to develop Ubuntu apps of all types, with QML, HTML5 and C++.
If you are looking to develop applications for Ubuntu, you need to install Ubuntu SDK (Software Development Kit). Ubuntu SDK is based on Qt Creator (IDE for Qt development) and tailored for developing apps for Ubuntu and Ubuntu Touch. While I am not going to teach you Qt development, I can surely show you how to install and configure Ubuntu SDK in Ubuntu 14.04 and 14.10. You can work on your own thereafter as tons of help is available online.