What was the agreement with the hiring company? If they apply for the WP3 letter at ministry of labour, it takes around 3 months and then with that letter you can apply for a non-immigrant B visa at an embassy. If you come as tourist, you can come right away but might not have enough time to receive the WP3 letter in time.
Yes, lost. I think you can find multiple METV posts here in this group mentioning the same thing. METV is valid from issue date and not from first arrival.
It means you have to prove you have enough money in your bank. If you have a savings account then just get a fresh statement showing the balance is more than 200k thb in AUD.
registering TM30 online, to get the username and password has nothing to do with tenant. Only landord/owner details needed. Once it's done and owner gives you the login details (or she can do herself/himself), it's 1 minute to fill in the data (e.g. passport number and TM6 form number) and nothing has to be uploaded as picture.