I am new to chickens. My coop is on the ground. We added a little straw under the roost. Tomorrow I am gonna put down pine shavings and DE. How do I do it? Do I need to rake out the poop and straw that is in there now or can I leave that? Can I just sprinkle the DE on top then add the shavings then mix it all up ? Have no clue what I am doing. Need advice on how to do it.