Your question is not well organzied, so its a bit tough to understand what you are attempting to do.
First, don’t use soap-rpc. Lots of posts here on why not.
The soap client in XML Spy creates a soap request based on a WSDL file and posts it to the URL found in the WSDL or to an endpoint address that you supply to override what is in the WSDL.
If your WSDL is incorrect either in how it describes the request message for your operation or in the endpoint URL, your request will fail.
Also, during testing, be sure to set the ACL on the Flow service you are attempting to invoke to Anonymous. This should be changed as you promote the code to testing environments.
I have no idea whatsoeer what you are asking in your second question. The Flow generated by the Web Service Connector wizard will successfully invoke a simple soap-rpc or soap document/literal style web service operation if the WSDL (and any imported schemas) are properly formed. However, I do not recommend using the WSC for anything beyond early prototyping. Again, lots of posts here on why not.
Mark
#webMethods#soa#API-Management