What province are you in? Some immigration offices have a drive thru/walk up for 90 day reports. I just did mine in chiang mai. Including filling out the form it only took about 10 minutes. You'll just need your passport, tm30 and a filled out tm47 which is the actual report form. The arrival card shouldn't be needed as we all fill out a tdac digitally on entering.
You can use whatever address you plan to stay at on arrival even 1 night in a hotel, just make sure whomever you rent from updates your tm30 including whoever your friend rents from. He must notify the owner and have them file a tm30 for any foreigners staying there.
yes bangkok has everything available even large silver bars. I think if silver didn't have vat and premiums it would be more attractive to thai people for investment.
thai gold is 23k 96.5% and fake gold is extremely rare here. The gold industry in thailand is closely regulated and most stores are generational businesses or large chains they wouldn't risk selling fake gold. Gold in thailand is extremely liquid with low premiums.
it's an easy way or go second floor of immigration and try to pay 500 baht for express service. It's not alot of money either way so upto you and you're welcome 🙏
Go to the colonel across the street from immigration. They will ask for your passport and tm 30. For a fee of 1000thb They will have it rdy the next day.
I would leave the country and apply for a dependant visa for your son based on your dtv. It can't be applied from inside thailand anyway so use this time to visit an adjacent country, apply for your sons dtv dependant visa and wait.