Hi, I am new to raising chickens. Our girls are now about 5 weeks old and we are gettting ready to put them outside soon. I bought a commercial coop with a small run under it. we plan to put concrete paving stones under the coop to help prevent the wood from rotting. We are in the process of putting up a large metal run 9’ x 12’. It has a mesh roof and 1/2 of the roof will be covered with a tarp. I am wondering if I should get another tarp so it is completely covered? We plan to put up skirting around the perimeters of the run. our yard is totally fenced in as well. The coop will be located in the run. Right now we do not have a “floor” for the run. Should we put mesh under the run? Also do we need to have some type of bedding on the floor of the run? I read the articles about the litter used in the coops and concern for mold/ammonia levels if the litter gets wet. The sides of the run are mesh. we live in Texas so the winters are mild and the Summers very hot. I don’t know that I want to use sand on the floor as it sounds like that can be hard to get rid of. Any suggestions are appreciated. Thanks.