What paperwork is required for a 90-day check-in after obtaining a retirement visa in Thailand?

Advice Please

Hi folks and thanks for reading my post. I have just been granted a years retirement visa after converting it from a 90 day . I did the application through a Visa agent and it went well. They opened my bank account for me deposited 800000 baht then withdrew it so I didn’t even have to keep that in my account. They told me I will have to visit the immigration office in 90 days and due to language barriers I’m not sure what paper work will be required when I visit the office. Will I still need to deposit the 800000 baht. Answers and experiences greatly appreciated.

Thankyou