SOA WEB SERVICE

Dear Experts,

My Client requested a creation of a SOA WEB SERVICE. This service must sends a xml file.

I am pretty NEWBIE in this area and I would like to know if there is any how-to guide to create and publish this web service.

Also, with the Client documentation, I was unable to get the WDSL file. I understand this this mandatory for the web service configuration, right?

thanks a lot,

Flavio