Your customers can not be in Thailand, so no need for a Thai bank account, but a account in the country of your customers, so they don’t need to pay for international transfers.

Ansked and answered numerous times.

One of the more complex ways to go with big risk of rejection, and thereby losing the 10.000+ baht visafee.

Depending which Embassy you apply at income is of less importance.

It’s the deposited 500.000 baht at least, which is important.

Read the local Immigration office’s website.

Not savings account, regular immediately accessible account only.

Search the group for the specific embassy you are interested to apply at, and concentrate on answers regarding that embassy only, since requirements differ from embassy to embassy

It cannot be a saving account has to be a normal deposit account as written explicitly on the Embassy website

You should read the Embassy website thoroughly before applying.

Now is high season for visa applications, so expect longer than normal visa processing times.

Additional Documentation will reset processing time to zero

It is not you who are doing the TM30, but the hotel / landlord. If you may need it later, ask for a copy at arrival, and not 82 days later, when it can be hard to find for the receptionist ( especially if you have changed hotel / place to stay.

90-days report shall, as name implies, be done after 90 CONSECUTIVE days in Thailand and not until then.