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            object oMissing = System.Reflection.Missing.Value;
 
            Microsoft.Office.Interop.Word.Application oWord;
            oWord = new Microsoft.Office.Interop.Word.Application();
            oWord.Visible = true;
 
            Microsoft.Office.Interop.Word.Document oDoc;
            oDoc = oWord.Documents.Add(ref oMissing, ref oMissing, ref oMissing, ref oMissing);
 
            // add text
            Microsoft.Office.Interop.Word.Paragraph oPara1;
            oPara1 = oDoc.Paragraphs.Add(ref oMissing);
            object styleHeading1 = "Heading 1";
            oPara1.Range.set_Style(ref styleHeading1);
            oPara1.Range.Text = "Create a New Report";
            oPara1.Range.InsertParagraphAfter();
 
            Microsoft.Office.Interop.Word.Paragraph oPara2;
            oPara2 = oDoc.Paragraphs.Add(ref oMissing);
            oPara2.Range.Text = "";
            oPara2.Range.InsertParagraphAfter();
 
            Microsoft.Office.Interop.Word.Paragraph oPara3;
            oPara3 = oDoc.Paragraphs.Add(ref oMissing);
            oPara3.Range.Text = "This is my second paragraph.";
            oPara3.Range.InsertParagraphAfter();
 
 
            // add picture
            string imgName = "c://tmp/doc1.jpg";  //the picture file to be inserted
            Object oMissed = oDoc.Paragraphs[2].Range; //the position you want to insert
            Object oLinkToFile = false;  //default
            Object oSaveWithDocument = true;//default
            oDoc.InlineShapes.AddPicture(imgName, ref  oLinkToFile, ref  oSaveWithDocument, ref  oMissed);
 
 
            // save
            object fileName = "C:\\tmp\\test_report.doc";
            oDoc.SaveAs(ref fileName, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing);
            oDoc.Close(ref oMissing, ref oMissing, ref oMissing);
            oWord.Quit(ref oMissing, ref oMissing, ref oMissing);
            oWord = null; // Free up any memory used
 
 
Word Object Model Overview
Ref: suite101.com