We do not have the rocks down here, I just seeded a area sort of like that around septic tank where the dirt was very unlevel and grass sparse. I used box blade rippers to break the dirt up. Then raised the rippers and leveled the area.Bahia grass seed was spread by hand and worked in with a garden rake.If area is too big to use rake or hand spread the grass, a pto spreader and chain harrow can be used on large scale. A three point landscape rake can also be used to help clear rocks and debris from the area.Guess a lot depends on what you have allready and how much you would use the other equipment along with costs