Besides a 6 gauge primary, what size wire would you recommend from fuse block to relay, relay to switch, and relay to accessory.

I’m running 100 amp circuit breaker to 100 amp blue sea block. Running 30" light bar, 2 4" back up lights, cheap ass rock lights, and 200 w 4 speaker stereo.

Should I just run 12 gauge all around or is that too much going to switches? The rock lights have a cheap 18-22 gauge coming off of them. Are the wiring harness tat came with relays seem to be 18-22 as well, maybe 16.

What do ya’ll recommend?

Thanks