For Tomcat and Eclipse configuration details, see the chapter Test Your SAPUI5 Application on a Java Web Server in the Developer Guide for User Interface Add-On at http://help.sap.com/nw-uiaddon
To use the proxy, you need to change the OData service URL of the SAP-delivered standard application. First, look for the OData service URL in the Configuration.js file inside the WebContent folder. Inside the file, look for an object called serviceList and a property called serviceUrl. Then change it to what is shown below.
To configure the application, see chapter 18.104.22.168, Local Sandbox Environment for the Launchpad, in the Developer Guide for User Interface Add-On at http://help.sap.com/nw-uiaddon.