A family of Microsoft word processing software products for creating web, email, and print documents.
I'm still here. :-)
A macro can probably do what you want, but the details of the task aren't clear from your post. Its design will depend on (a) what you mean by "automated", (b) how you want the result to be displayed, and (c) which section's word count should be displayed.
If "automated" means "updating in real time without any special keystroke to launch the macro", that's possible but probably not necessary, given the next points. The count could be displayed in a message box (only when requested by a keyboard shortcut) or constantly in the status bar at the bottom of the window (but then the usual contents of the status bar can't be shown, which may be problematic). In either case, the count could be only for the section that contains the cursor; the message box could contain the counts for all sections.
I suspect you want this macro only for the document you're working on now, not for all your documents. If the macro is stored in your Normal.dotm template, it would have to verify -- each time it starts -- that the active document is the correct one; that's not a good idea. Instead, the macro should be stored in the document itself or in the template on which the document is based (which should not be Normal.dotm). Since the document will be distributed as a PDF, the document can be a macro-enabled (*.docm) file instead of a *.docx,
I'll guess that if you need instructions on how to create and store a macro, you've never done those tasks, so the explanation has to be at beginner level. You should start by reading https://www.gmayor.com/installing_macro.htm .