An ATM could not be any more user friendly. Put card in, choose English, put in PIN/password/secret code, push button for withdraw money, money come out, take money. Not sure why you'd need a tutorial or to take photos of each screen.
Yes, the password you generate for ibanking is a temporary password that you'll need to change after using it to first login, as a security measure. If you want to transfer more than 50,000 baht a day, you need to do a facial scan, if not, then you don't. Anything else, like you said, it's the bank's job to help you and it sounds like they're gonna need a lot of patience.