(I was advised not to just arrive on a 30 day stamp, as it's harder to convert to non-o, you have less time to open a bank account, move money and submit the 90 day non-o)
Visit your Embassy, obtain an Embassy Certified Copy of your passport
Open Thai bank account.
Needing the above copy of passport, you address in Thailand (TM30 copy) and a Thai friend to help, vouch for you and your address details.
I recommend Bangkok Bank, head office Bangkok, they have English speaking staff who are familiar with the process.
Move 800k
Apply for no-no retirement 90 days 1900thb (nb you need a minimum of 15 days left on your entry stamp)
After money seasoned for 2 months, apply for 12 month extension, 2000thb
there are reports from last week of Immigration at CW asking unvaccinated people without a recent atk test to do one there, before going into the building