I'll never get tired of advertising the JavaRanch Web Services FAQ
For starters, read the articles labelled "Another article on JavaWorld" and "Article on OnJava". If you need more background on
SOAP, read the one labelled "Introduction to SOAP and Apache SOAP". Then come back here with any specific questions you may have, and we'll try to fill in the blanks.
By the way, you can edit your previous posts. When looking at one of your posts, click on the icon showing a document and a pencil, and you can edit that post.