as I understand it, uou cannot rent out a property for less than 30 days without a Hotel License under the Hotels Act. This primarily applies to condo buildings.
The Hotel Act, B.E. 2547 (2004), Section 15 states “No person shall operate a hotel business unless he has obtained a license issued by the Registrar. The application for and issuance of a license shall be in accordance with the rules and procedures prescribed by the Minister (8).”
There is an exemption for homes and villas (less than 4 units) and they must be registered with the Ministry of Tourism.
The Ministerial Regulations on the Types and Guidelines on Hotel Business Operation B.E. 2551 (2008), Chapter 1, Clause 1, it allows certain properties to be exempt from The Hotel Act, where it states: “Temporary accommodations which are established for commercial purposes for travelers or any person have less than four rooms in the buildings and less than twenty residents, a hotel license is exempted (9).”
Wise to Thai bank, the sender incurs the charges which are relatively small depending on the amount sent.
Having a Thai bank account, for a standard current account there are no fees other than the ATM card. There are ATM fees however if you don't use that bank's ATM or use it outside the area in which it was issued. These fees are small approx 15B.
To the best of my knowledge you have to be outside Thailand to apply for a tourist visa. Anything done inside the country would be an extension to that visa
Get a 90 day Non-O visa. Reason, visiting or staying with applicants family resided in Thailand (more than 60 days), easy to do. You can write a letter of invitation with the approval of your inlaws, include a copy of their ID card in the letter.
YouTube has plenty of resources and that is where I started.
Learn to read/write at a basic level, it really helps especially if you want something more than the usual tourist nonsense.
As mentioned earlier the book "Thai for beginners" by Benjawan Poomsan Becker is very good and they also provide an excellent English/Thai dictionary app.
Additionally Facebook, instagram and Tiktok have many many Thai language learning resources.
Reading and writing will take you a long way and improve your conversation. It looks hard, but honestly it's not that difficult once you can identify the words.