before call webservice use MessageAssignment ( to set the value means to say the web service need some parameter set the parameter value with you XSD element value ) the call the webservice …if you add the reference of webservice to your biztalk application it will automatically create the PortType use that port type it will be SOAP type and direction will be Send and Received
if you need help let me know i will write the each steps
regards
Akash KB ([email protected])