Option Explicit

Sub FormatTitle()
Const sList As String = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 -"
Dim rngTitle As Range
    Set rngTitle = ActiveDocument.Range
    rngTitle.Collapse 1
    rngTitle.MoveEndWhile sList
    TrueTitleCase rngTitle
End Sub

Sub TrueTitleCase(oRng As Range)
Dim vFindText As Variant
Dim vReplText As Variant
Dim i As Long
Dim k As Long
Dim m As Long
    'count the characters in the selected string
    k = Len(oRng)
    If k < 1 Then
        'If none, then the range is empty
        'so warn the user
        MsgBox "The range has no text!", vbOKOnly, "No text selected"
        Exit Sub    'and quit the macro
    End If
    'format the selected string as title case
    oRng.Case = wdTitleWord
    'list the exceptions to look for in an array
    vFindText = Array("A", "An", "And", "As", "At", "But", "By", "For", _
                      "If", "In", "Of", "On", "Or", "The", "To", "With")
    'list their replacements in a matching array
    vReplText = Array("a", "an", "and", "as", "at", "but", "by", "for", _
                      "if", "in", "of", "on", "or", "the", "to", "with")
    With oRng
        With .Find
            'replace items in the first list
            'with the corresponding items from the second
            .ClearFormatting
            .Replacement.ClearFormatting
            .Forward = True
            .Wrap = wdFindStop
            .MatchWholeWord = True
            .MatchWildcards = False
            .MatchSoundsLike = False
            .MatchAllWordForms = False
            .Format = True
            .MatchCase = True
            For i = LBound(vFindText) To UBound(vFindText)
                .Text = vFindText(i)
                .Replacement.Text = vReplText(i)
                .Execute Replace:=wdReplaceAll
            Next i
        End With
        'Reduce the range of the selected text
        'to encompass only the first character
        .MoveEnd Unit:=wdCharacter, Count:=-Len(oRng) + 1
        'format that character as upper case
        .Case = wdUpperCase
        'restore the selected text to its original length
        .MoveEnd Unit:=wdCharacter, Count:=k
        'and check to see if the string contains a colon
        If InStr(1, oRng, ":") > 0 Then
            'If it does note the position of the character
            'after the first colon
            m = InStr(1, oRng, ":") + 1
            'and set that as the new start of the selected text
            .MoveStart wdCharacter, m
            'set the end of the selected text to include
            'one extra character
            .MoveEnd Unit:=wdCharacter, Count:=-Len(oRng) + 1
            'format that character as upper case
            .Case = wdUpperCase
        End If
    End With
lbl_Exit:
    Exit Sub
End Sub