Getting Started
Here you find information on how to adjust your enviroment and to get started with some easy examples including an introduction to the SAPUI5 tools.
You've installed the SAPUI5 runtime and tools.
If not already done so, refer to SAP note 1747308 
on installation of
SAPUI5.
Before you really get started, check the list of supported browsers to choose one that fits your needs.
To get started with SAPUI5, you have two different options: Either you just create an HTML page (even with notepad, if you want to) or you start directly using the SAPUI5 tools in Eclipse.
Creating Simple SAPUI5 Applications
The easiest way to work with SAPUI5 is to include a set of JavaScript libraries into your HTML page. After that you can use all controls provided by these libraries to construct one or more control trees and include them into your HTML page. The framework also supports the JavaScript Object Notation (JSON) to initialize controls with a reduced typing effort.
Creating Mobile Apps with SAPUI5
SAPUI5 provides an additional control library called sap.m, which is optimized for mobile devices.
Create Applications using SAPUI5 tools
Using the SAPUI5 application tools in Eclipse allows you to create sophisticated SAPUI5 application projects based on the Model View Controller concept. The tools provide additional features such as SAPUI5 Snippets or JavaScript Templates.They provide wizards to create SAPUI5 applications for desktop as well as for mobile devices.
Develop Your First Application using SAPUI5 ToolsThere are different options to test your applications: