You won't know the best way to do it until after you've done it because every situation is different and subject to second guessing. You will have to mid-course correct.
I've done it all sorts of ways and have had the best luck with cutting the bigger stuff flush with the ground, spraying the cut stump with a killer herbicide and when all done have a dozer skim things and push the dirt around to cover most of the stumps. Spray an herbicide to kill the smaller stuff before dozing. Then I seeded and could mow most all of it with a bush hog. Any problem stumps got dug up in future years but were easier to get out by then. Most evergreens won't sprout but cedar will unless you get it all.
When I dug stumps out, it took forever and was hard on the equipment.