I have a homeowner that wants me to redo their lawn. The redo will consist of tilling up the soil and adding lime, fert and seed. the problem is that the lawn is covered in moss and weeds. I have a pesticide liciense but am very inexperienced in the use of weed killers ( I just took the test to see if I could pass it). I am considering using roundup to kill off the entire lawn but am not sure if that will keep the moss from coming back. The county ag office suggested using copper sulfate, but had no recommendations as to amounts to use. The area for the redo is just over 7000 sqft. Any suggestions for the type and amount of herbicide to use. There are no bedding areas and a couple of large oak trees in this lawn. It is also located on a steep slope and bordered by hiways and driveways on each side so leaching and drift shouldnt be of much concern.