Bus/boat reservations for Oirase Autumn 2023

I'm planning a good-bye trip to old priced JR Pass this autumn :))

Usually how crowded is it in Oirase stream, Aomori please? Do I need to reserve bus ticket for multiple short rides from Ishigedo to Towadako? And how to reserve with JR Pass? I can only get the pass when I arrive in Japan (don't buy it online).

And can I book the Towadako boat cruise online?

I'm thinking about taking a bus from Amomori to Ishigedo then walk or take short rides to Yasumiya then boat ride to Nenokuchi and bus to Hachinohe.

Thanks.