make sure your Template File is saved as .dwt than you just have to go to tools -> options -> Tab "Files" -> scoll down to "Template setting and browse to the path where you have your template saved under "Default template for sheet creation and Page setup override".
(not 100% thats the one maybe "Drawing Template file location" instead).
We just have a Standard .dwg file that we open and start working on. We never start a new drawing via Autocad only via explorer and "save as" to the desired location.
Hope that helped.