0baht or equivalent available some Embassies are requiring this as a final account figure , some want it as a minimum balance over a period of 3 or 6 months.
Can you show your income from YouTube has been assessed for income tax and can you show this on your tax return that you will more than likely have to submit.
Visa is valid from day approved. You get 180 days on entry then you either leave or extend ONCE for a further 180 days after which you MUST EXIT Thailand and re enter. Each entry can be extended only once. The last date you can enter Thailand is the valid until date shown on your visa.