Sage 300 ERP 2014 Web Deployment developing and implementing custom screens

Hello!  We have successfully implemented the web deployment on a new server with Sage 300 ERP 2014 on a Windows Server 2012 R2.  Can anyone tell me where we can get some instruction on how to implement our custom screens on the web deployment?  From what I have read, we need to use the SDK to make modifications using the existing screens and then build a cab for web deployment.  I would like to find a class or just some documentation on how this works exactly.

Thanks so much for your help!