As Andrew says, your requirement is vague. If you want to open a series of documents when you start Word then see
Save Record And Close
If you want to load a set of add-in templates when Word starts then if you have not changed the preferred startup folder it can be located (in English language versions of Windows) by typing
%appdata%\Microsoft\Word\Startup
in the Windows File Explorer Address bar and pressing Enter.
You may find
Load Word add-ins for the current session only useful.
Word (and Excel) are poor with regard to working document folders. They used to be better up to Word 2010, but then Microsoft became fixated on cloud based file storage as another potential revenue stream. To address this see also
Select Document Template which makes accessing templates from various folders much more practical.