Can you ADB push files to the sd card without an OS installed??? topic

I just accidentally wiped my SD card and my system and now I don't know how to get a rom onto my phone due to the lack of an SD card slot. Can anyone help me get a rom on the internal so I can flash? I have TWRP still but I have no clue how to get a rom to my sd card. Am I screwed? Cause I read a forum that had to have usb-debugging on and I have no system lol. Thank you guys so much