Am I missing something obvious here?
IMO you are missing something, but the use of the word "Goto" can create the wrong impression.
.Goto actually makes the object that you specify "goto" the specified location. So if that object is a range, you shouldn't expect the Selection to change.
The other thing is that you have to omit the "which" parameter in this case. I don't know how you could determine that from the documentation - it's a question of trial and error with some of these range-related things.
Since the range implied by wDoc or wDoc.Content won't change anyway, you will lose any useful information immediately by executing the .Goto as a command. If you use it as a function, you get a range, so you can use, e.g.
Dim r As Word.Range
Set r = wDoc.Goto(What:=wdGoToBookmark, Which:=wdGoToFirst)
Debug.print r.start, r.end
Or if you want to select the resulting range, you can use
r.Select
But if you want to set a range
Dim r As Word.Range
Set r = wDoc.Bookmarks("TemplatePage)
is (IMO) simpler and you already have the code that actually selects it if that is what you need.