It would make far more sense to add spacing to the paragraphs than to add empty paragraphs.
Selection.ParagraphFormat.SpaceAfter = 12
Or better still create a paragraph style in the template/document with the spacing you require and apply it to the selection. e.g.
Selection.Style = "Stylename"
Empty paragraphs are used by typewriters. Wordprocessors use spacing which makes subsequent editing far more simple. However if you insist
Dim lngPara As Long
For lngPara = Selection.Paragraphs.Count To 1 Step -1
Selection.Paragraphs(lngPara).Range.InsertParagraphAfter
Next lngPara