Use Find object to manipulate all appearances of a text of a document

Using Find method of Select object is very effective way to change all appearance of a text in a document. For example you may want to capitalize all the first case after ” in the document. Below is pseudo code to demo it:

Sub convertToUppercases() 
   'Goto start of the document 
    Selection.HomeKey Unit:=wdStory 
    switchCases False 
End Sub 
Sub convertToLowercases() 
    'Goto start of the document 
     Selection.HomeKey Unit:=wdStory 
     switchCases True 
End Sub 

Sub switchCases(ByVal bToLowerCase As Boolean) 
    Dim sText As String 
    Dim lCount As Long 
    Selection.Find.ClearFormatting 'Clear current find  
    With Selection.Find  
        .Text = <put some text need to be found here>   
        .Replacement.Text = ""   
        .Forward = True   
        .Wrap = wdFindContinue   
        .Format = True   
        .MatchCase = False   
        .MatchWholeWord = False   
        .MatchAllWordForms = False   
        .MatchSoundsLike = False   
        .MatchWildcards = True   
    End With    
    Do    
        Selection.Find.Execute     
        If Selection.Find.Found Then     
            if bToLowerCase then     
                <put the code need to be done here>     
            else     
                <put the code need to be done here>     
            end if     
        end if     
    Loop Until Not Selection.Find.Found     
End Sub