To get the wsdl file, you can call the following link:
http://<Hostname>:port/valuemation context/services/WorkflowExecutionServicePort?wsdl
Example: http://localhost:8082/vmweb/services/WorkflowExecutionServicePort?wsdl
See Also
VM Webservice for Starting a Workflow
Transfering a Parameter to Execute the Webservice
Return Parameters from the Webservice
Example