I just installed new 4th gen brakes. ls1 disc's front and back w/ new rotors calapers And ceramic pads. What is the proper break in procedure?

Depends the manufacture should have a go by..

Make sure you clean rotors with brake cleaner as rotors have a rust protectant on them
And rotors nowadays have non directional grinding to help with the bedding

But usually the bedding procedure is back to back stops from 60-40 to 10-5mph around 5 to 6 times

At first you might feel that the pads are not gripping compared that just means pads are not bedded as you bed pads in you will gradually start to feel pads gripping more and more