What exactly are you trying to check and why?
What do you mean by a 'line'. Lines in Word are volatile entities created by text flow. Do you perhaps mean 'paragraph'?
There is no reason to 'move the cursor, to establish what the first character of a paragraph is, but if you insist, the following will work for the document body.
Code:
Dim oPara As Paragraph
For Each oPara In ActiveDocument.Paragraphs
oPara.Range.Characters(1).Select
MsgBox oPara.Range.Characters(1)
Next oPara