I need some help on how much to order for these two jobs and have not done enough of these to be real comfortable yet. First job is putting rocks in a flower bed. The bed is 100 feet long, 20 feet wide and the rocks need to be approx. two inches deep. The second job requires good dirt hauled in. It is 45 feet long and ten feet wide. The dirt will have to be three inches deep. Any advice on how to figure this would be appreciated. I am trying to broaden my horizen instead of just lawn and shrub care and get into bigger jobs. But also learned long ago if you don't know how to figure it leave it be!