Hello and welcome.
if you did not search the forum, maybe give it a try. It has been long since I did it last time, so cant remember the details. I found this post that sums up how it should go.
If it would not work, before you give up custom watch faces, maybe try some other platforms like facer.io. When it works, the connection and faces uploading to watch seems easier to me. Drawback is slightly higher battery drain than with GWS faces.