I recommend: Enter Thailand visa exempt. Currently, this gives you a 45-day permission to stay, but the first part of that will almost certainly be taken up with a mandatory quarantine of 7-14 days. On exit from quarantine, if you do not already have a Thai bank account, your first task is to open one. This is not always easy, but an agent can help you if you are unable to do it yourself. Transfer an amount greater than 800,000 baht into the Thai bank account using a method that will allow you to get a transaction slip from the Thai bank confirming the money came from abroad.