Consuming WCF Web Service - Beginner Level

We are trying to create a web service that will create a pdf using a third party tool. Only trouble is none of us have ever created a WCF and then consumed it on a Windows Form before.

I have added the reference successfully and can reference the class I created but I cannot figure out how to make it do it's job. I need to send a URL to the web service from a Web Browser Control. The web service will then create the PDF in byte code, then send it back to the client, the client will then show the PDF in a Web Browser Control. Can someone please tell me what I need to do? Any help will be appreciated. Thanks.

VB:

Imports System.ServiceModel
Imports WebSupergoo.ABCpdf8

<ServiceContract()>
Public Interface ICreatePDF

    <OperationContract()>
    Function CreatePDF(ByVal givenURL As String) As Byte
End Interface

The Client Windows Form has the Service referenced. I just need to send the URL and then return the byte data the service renders.
svc.vb:

Imports WebSupergoo.ABCpdf8

Public Class CreatePDF
    Implements ICreatePDF

    Public Function CreatePDF(ByVal givenURL As String) As Byte Implements ICreatePDF.CreatePDF
        Dim theDoc As New Doc
        Dim theID = theDoc.AddImageUrl(givenURL, True, 0, True)

        Do While True
            theDoc.FrameRect()
            If Not theDoc.Chainable(theID) Then
                Exit Do
            End If

            theDoc.Page = theDoc.AddPage()
            theID = theDoc.AddImageToChain(theID)
        Loop
        theDoc.SaveOptions.Linearize = True

        Dim theData As Byte() = theDoc.GetData()

        Return theData(0)
    End Function

End Class