I need some help, I’ve been working on putting fog lights on my car and I want to hook up a switch. I was wondering if there is a hole in the firewall already that wires go through that would be dealt accessible. I’ve looked for like an hour and I can’t find one and would like to not like to drill holes in my car.

The simplest way is to make a tight loop on the end of a coathanger and sharpen the other end. Wrap the wire(s) around the loop end, then use the sharpened end to poke through the large rubber grommet where the Engine Room Harness goes through the firewall. Then locate the end of the coathanger inside the car and pull it through the grommet along with the wires. Put some RTV around the wires on both sides when you're done to make sure the grommet doesn't leak.

I may be dumb asking this but where is the Engine Room Harness that goes through the fire wall, pics would help

Don't have a J30/M30 to take a pic for you, but you should have a grommet something like the one below going through the firewall at one or both upper corners: