First time filing for a day trader...

Can someone tell me how to report the day trading transactions?  Sch. D or Sch. C?

I'm using Proseries Basic...   TP has loses of around 50K...

Do i need to make the election for the TP (Mark to Market)  How is that done? Is it to late to make that election for 2019 taxes?

Are the day trader transactions reported on Sch. D then the expenses reported on Sch. C?

Any help would be greatly appreciated...

Thanks in Advance!