3115/mark-to-mark day trader

Hi, I want to start day trading 1/1/2024 , should I file 3115 through my 2023 tax return? I already read 3115 instruction so confused regarding preceding year and before tax due date so please just give the answer by YES or NO and example with year like 2024, 2023, ..... and due date. If I want to have extension for 2023 when should file 3115? Around 16 OCT or April 15 2024?

question 2:

If I have had a loss $10000 for day trading in 2023; and never filed 3115, what can I do? Please just give me the answer and do not copy paste the instruction since I already read it but did not get it.