I need to create a Windows Phone 8.0 as well as Windows Phone 8.1 app from already developed IBM Worklight(6.1) Project. Is there any document that elucidates end to end solution to do that? Also could you please elucidate tools/plugins required?
To your existing MFP/Worklight project, you can add the Windows Phone environment. This will generate the Visual Studio project for Windows Phone. The same app can be run on Windows Phone 8.0 and 8.1.
The following getting started modules give you an overview of whats needed to develop a Windows Phone app.