Open XML Creating a word File

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C#

Hello All. I'd like to ask in a console application I want to get the content of a word, that has for example two field (name and Family) and show it to User(showing the word file to User). And let user to fill in the word file and then save it in a directory :
I have write something like this, but it can only copy the content in other word document. How can I show the file to User? And ultimately save it in the other document?

string docTemplatePath = @"E:m.docx";
           string docOutputPath = @"E:mm.docx";


           File.Copy(docTemplatePath, docOutputPath);



           using (WordprocessingDocument doc = WordprocessingDocument.Open(docOutputPath, true))
           {

               string newXml = "<root>"+
                               "<MatterNumber>00011111</MatterNumber>" +
                               "<DocType>Contract</DocType>"
                               "<root>";

               MainDocumentPart main = doc.MainDocumentPart;
               main.DeleteParts<CustomXmlPart>(main.CustomXmlParts);


               CustomXmlPart customXml = main.AddCustomXmlPart(CustomXmlPartType.CustomXml);
               using (StreamWriter ts = new StreamWriter(customXml.GetStream()))
               {

                   ts.Write(newXml);
               }


           }

           Console.WriteLine("Done");
           Console.ReadLine();