Is this for a DB or DC plan? The rules differ. I will state my answers for a DB plan ......
1. For an annual payment by 4/1/2023, RMD payment should be the annual RMD, $24,000. April 1 is a BEGINNING date, for monthly payments, but for an Annual RMD, you should pay the entire Accrued Benefit x12 as of 12/31/2022.
2. At least $24,000, plus an interest adjustment (actuarial increase) for delayed payment that was due 4/1/2023. There is also potential 50% Excise Tax for missing 4/1/2023 deadline. What/when is the NEXT RMD payment going to be?
3. $36,000 should be received in 2024. I think this should be paid around 4/1/2024 (or 1st anniversary of 2023 payment, if earlier than 4/1/2023).
.... Jeff