Consuming wsdl, PLEASE HELP!!!

Question

I'm on a new project and this is the first time I'm going to work with web services using wsdl. I read some tutorials from the net and books today but still don't get the point especially what next after using cfinvoke.
I used cfinvoke as suggested by the adobe live doc, tutorial and get the returnvariable, dumped this variable and I can see a structure in red color with class name and many methods.
my question is, what next?
I can't find any article that help me describe the next step.
How am I supposed to get the data or the xml file (?), sorry I'm very new with web service.

Answer 1

Here are the codes:
<cfinvoke 
webservice="https://amn.mod.com/ws_20/generalquery.asmx?wsdl" method="GetOneMember" returnvariable="result2">
   <cfinvokeargument name="login" value="mylogin"> 
   <cfinvokeargument name="password" value="mypassword"> 
   <cfinvokeargument name="columns" value="firstname, Lastname,zip"> 
   <cfinvokeargument name="constituentId" value="0003009">
</cfinvoke>
  <cfdump var="#result2#">
<p>
 <!--- Checking what are the sub functions of GetAllColumns ---><cfscript>mydata2 = structnew();
mydata2.firstname
= result2.GetMemberInformation;
</cfscript>
  <cfdump var="#mydata2#" label="mydata2">
<p>
Error:
Element GETMEMBERINFORMATION is undefined in RESULT2.
The error occurred in C:\Inetpub\wwwroot\scratch\iModule\imodule_1.cfm: line 89
87 : <cfscript>
88 : mydata2 =structnew();
89 : mydata2.firstname  = result2.GetMemberInformation;
90 : </cfscript>
91 :