Hi, Im struggline with all the required documents in order to get a visa. I would like to apply for the STV can you guys help me out?

I am from the Netherlands, might be relevant for below questions.

1. An English Extract from the register of population (where do I get this)

1. A Certificate of Good Conduct (where do I get this?)

1. A medical certificate (Does this needs to be filled out by the doctor?)

1. Proof of payment (paid in full) for the accommodation in Thailand for the whole period of intended stay (Do I really need to pre-book my entire trip? I do not want to plan that much..)

1. Confirmed roundtrip flight reservation or ticket ( I only have a one way trip, planning for a 4 month trip and I am hoping that other countries are opening their borders soon)

Thank you!!

Edited to add:

I’ve just had the document reccomend below translated and it says it’s for people staying in Thailand.

Has anyone managed to get a police check because they are leaving Thailand?

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Has anyone got a police check certificate while on a non-o (dependant of a foreigner) recently?

I attempted today and was refused as I don’t have a work permit. I was told to get a letter from immigration but they couldn’t tell me what the name of the letter is, what to ask for or what division to get it from.....

Any advice before I go into immigration blind 🤷🏻‍♀️