i changed the word "headers" in your post to "headings." I hope I was correct in doing this. These words mean very different things in Word jargon.
See the following:
Item 2 on your list. The usual use of a template is to double-click on it or select it to create a new document based on the template. You can make the template read-only if you need more protection. Templates should not be opened and then saved using SaveAs to create a new document.
Item 3 I don't understand. You can add space-before formatting to any paragraph style. Is this what you mean?