If you are familiar with either batch files or Visual Basic - including VBA and VBScript - then WSH should be relatively simple for you to get to grips with, the MSDN WSH site or the MSDN Search Engine provides a whole host of samples and information on WSH, the microsoft.public.inetexplorer.scripting or the microsoft.public.scripting.wsh newsgroups as well as the Dev Guru Reference Site provide a development community to assist when developing WSH and related scripts.
A WSH file is a plain text file containing the WSH commands and should be saved with a .wsf extentsion, although it is more common to see the file extentsion being .vbs for WSH files written in VBScript or .js for WSH files written in Microsoft Javascript. WSH files can be creating in a variety of tools including NotePad and WordPad.
This section of my site contains more information on WSH as well as some detailed worked examples.