While Learning Vsto With Word I have came Some simple Code snippet which may come handy.
When The Real programming Begins ..
Requirment :-Interest with
Vs2008
and Vsto
Let Start
1} 
Inserting Text in Word 2007InsertAfter method inserts text at the end of the active range or selection, whereas InsertBefore inserts text at the start of the active range or selection.
Code :-
         // Using InsertBefore method inserts text
          this.Application.ActiveDocument.Content.InsertBefore("Avinash @ The Start-");       
          //using  Insert method insert text
          this.Application.ActiveDocument.Content.InsertAfter(" - Avinash @ the End ");
Same Opertion Can be Performed using Selection Object
     // Using Selection Object inserting text after the text
          this.Application.Selection.InsertAfter("Avinash @ The End");
          // Using Selection Object inserting text before the text
          this.Application.Selection.InsertBefore("Avinash @ The Start");
2} 
Selecting text in a Word 2007 document///Intializing the range object
          Word.Range PackRangeSelect;
          ////check the sentence count
          if (this.Sentences.Count >= 1)
          {
              ////set the start and end point has object
              object pktStartfrom = this.Sentences[2].Start;
              object pktStopHere = this.Sentences[5].End;
              ////assign the selection range
              PackRangeSelect = this.Range(ref pktStartfrom, ref pktStopHere);
              ////select the sentence using select() Method
              PackRangeSelect.Select();
          }
          else
          {
              return;
          }
OutPut
3} Creating Table in Word
//Object instance
           object pktMissing = System.Type.Missing;
           // Range on the application selection
           Word.Range PacktRangePresent = this.Application.Selection.Range;
           // Using Table object add in the Word document
           Word.Table PacktTable = this.Application.ActiveDocument.Tables.Add(PacktRangePresent, 3, 4, ref pktMissing, ref pktMissing);
           // Border propety of the Table we are creating
           Word.Border[] PacktBorder = new Word.Border[6];
           PacktBorder[0] = PacktTable.Borders[Word.WdBorderType.wdBorderLeft];
           PacktBorder[1] = PacktTable.Borders[Word.WdBorderType.wdBorderRight];
           PacktBorder[2] = PacktTable.Borders[Word.WdBorderType.wdBorderTop];
           PacktBorder[3] = PacktTable.Borders[Word.WdBorderType.wdBorderBottom];
           PacktBorder[4] = PacktTable.Borders[Word.WdBorderType.wdBorderHorizontal];
           PacktBorder[5] = PacktTable.Borders[Word.WdBorderType.wdBorderVertical];
           // Border formatting of the Table
           // Loop through the border and set color for table
           foreach (Word.Border pktBorder in PacktBorder)
           {
               // Table line style propety
               pktBorder.LineStyle = Word.WdLineStyle.wdLineStyleTriple;
               // Table line color property
               pktBorder.Color = Word.WdColor.wdColorGray30;
           }
Output:-