Consume secure webservice (ssl server authentication only) from VBScript

For a project we need to call some webservices from vbscript. These webservices are protected using SSL (Server only authentication).

I know how to do this in C#, C++ (using gSoap), but this is first time for me in VBScript. A sample webservice is like:

matchUser (firstname, lastname, gender, dob)

Webservice will return true/false to denote success/failure of webservice call, moreover it will also have a response parameter isMatchFound to denote if a match was found.

As I am completely new with VBScript, I googled and wrote few line of code to start with:

Function sendRequestToServer(firstname, lastname, gender, dob)

    Set oXMLHTTP = CreateObject("MSXML2.XMLHTTP.3.0")
    Set oXMLDoc = CreateObject("MSXML2.DOMDocument")

    URL = https://www.samplewebServer.com:1122/matchAlert?wsdl

    strEnvelope = "LastName=" & lastname & "FirstName=" & firstname & "Sex=" & gender & "BirthDate=" & dob

    Msgbox("Calling WebServices URL " + URL + strEnvelope)
    retryCount = 0

    On Error Resume Next
    Do
        Err.Clear  'clear whatever error we had in the last iteration
        retryCount = retryCount + 1
        call oXMLHTTP.open("POST", URL, false)
        call oXMLHTTP.setRequestHeader("Content-Type","application/x-www-form-urlencoded")
        call oXMLHTTP.send(strEnvelope)

        dim szResponse: szResponse = oXMLHTTP.responseText

        If Err Then WScript.Sleep 1000  'wait 1 seconds after an error occurred

    Loop While Err and retryCount < 3


    if (retryCount = 3 and Err.Number <> cstr(0)) then
        MsgBox "Web Service is Down"
    end if

    call oXMLDoc.loadXML(szResponse)

    if(oXMLDoc.parseError.errorCode <> 0) then
        Msgbox("ERROR")
        response = oXMLHTTP.responseText&" "&oXMLDoc.parseError.reason
        Msgbox(oXMLDoc.parseError.reason)
    else
        response = oXMLDoc.getElementsByTagName("string")(0).childNodes(0).text
    end if
End Function

1. How should I implement SSL server only authentication in above code?
2. How should I call a particular web service from the above mentioned WSDL URL (i.e. matchUser())
3. Is the way I am trying to pass parameters to matchUser() by building a string is correct? Or shall I build a XML string defining body of parameters?
4. How should I check return value from matchUser() web service?

Any help would be appreciated, a sample code is highly desirable but some pointers on how to get started would also be very helpful.