bold or not? the bookmarks ..this is the question

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I have the following code that will start from excel and will end in word :

this code will create an set of bookmarks in word bmk and tmk. What I do not know it is to set the fontsize and so one for apart bookmarks:
bmk to be bold size 11 and
tmk to be no_bold size 10

Sub CreateNewWordDoc() 
    Dim wrdApp As Word.Application 
    Dim wrdDoc As Word.Document 
    Dim i As Integer 
    Set wrdApp = CreateObject("Word.Application") 
    wrdApp.Visible = True 
    Set wrdDoc = wrdApp.Documents.Add 
    With wrdDoc 
        For i = 1 To 10 
            .Bookmarks.Add "bmk" & i, .Characters.Last 
            .Range.InsertAfter vbCrLf 
            .Bookmarks("bmk" & i).Range.Select 
            .Bookmarks("bmk" & i).Range.Font.Name = "Trebuchet MS" 
            .Bookmarks("bmk" & i).Range.Font.Size = 11 
            .Bookmarks("bmk" & i).Range.Font.Bold = True 
            .Bookmarks.Add "tmk" & i, .Characters.Last 
            .Range.InsertAfter vbCrLf 
            .Bookmarks("tmk" & i).Range.Select 
            .Bookmarks("tmk" & i).Range.Font.Name = "Trebuchet MS" 
            .Bookmarks("tmk" & i).Range.Font.Size = 10 
            .Bookmarks("tmk" & i).Range.Font.Bold = False 
        Next i 
        .Bookmarks("bmk1").Range.Text = "title" 
        .Bookmarks("tmk1").Range.Text = "content" 
    End With 
    Set wrdDoc = Nothing 
    Set wrdApp = Nothing 
End Sub

but nothing it is happening.. so, I know this is for excel but maybe someone know this.

thx