Hi!
Have you seen section 9.3 in my SCDJWS study notes?
http://www.slideshare.net/krizsan/scdjws-5-study-notes-3085287
In it, I describe how to develop a web service starting from a XML schema describing the input and output data of the web service, then write a WSDL, generate artifacts etc.
I use Eclipse and GlassFish v2 (but GlassFish v3 should be no different).
Additionally, this tutorial may be of some interest to you:
http://netbeans.org/kb/docs/websvc/jaxb.html
Best wishes!