Hi, Toritoribe,
I just came home after a week in Japan. Many thanks for the information. It really helped and it was exactly as you had posted.
The regular route bus can be taken from the same bus platform as the Roop bus at Yonago train station. The schedule is also posted at the platform.
The mountains and its temples were awesome. It was yellow, brown, red and green. Beautiful and well-worth the trip. The information centre staff was also great (spoke English too).
Many thanks once again!