ok then, so, what pins do i attach a usb port to, and what code do i need to get it running?

i am trying to create an nes clone using an esp32 that can take cartridges. The only problem is that it is a nightmare to try and get my head around. all i need to do is be able to load up roms from a usb drive, as the cart reader acts as a usb drive where the rom is stored. how would i read usb dri...