Hi!
As usual, I will shamelessly promote my own electronic book:
http://www.slideshare.net/krizsan/scdjws-5-study-notes-3085287
It is free so you can try it, delete it if you do not like it or keep it if you do.
Another free resource is the NetBeans web service tutorials:
http://netbeans.org/kb/trails/web.html
There are other books available, but these are not free:
J2EE Web Services - Richard Monson-Haefel (good introduction, but skip parts on JAX-RPC and UDDI)
Java Web Services Up and Running - Martin Kalin
If you do not already have experience with XML,
you should study it prior to reading anything else - it is a very important basis for web services with both JAX-WS and JAX-RS.
Best wishes!