Hi,
You can start of either with commercial products like Systinet, Weblogic or open sources like Apache Axis (xml.apache.org/axis). AXIS is currently a 1.0 RC1 candidate. The site contains examples, user guide to have a good start.
Ofcourse, you can also refer the book on AXIS from Wrox press (co-authored by me
)
I strongly recommend you to use the TCP Monitor Utility tool called 'tcpmon' that comes with AXIS to understand SOAP request and response messages for all the examples.
Regards,
Jeelani