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.
serviceUrl:"/ZF2UIAPPREF002/proxy/sap/opu/odata/sap/PS_MILESTONE_CONFIRM?",
To configure the application, see chapter 1.2.6.1, Local Sandbox Environment for the Launchpad, in the Developer Guide for User Interface Add-On at http://help.sap.com/nw-uiaddon .