With the tons of water we had here in Houston, Tx the last few weeks my backyard is a mess. The weeds have taken over and killed all the grass. How can we start all over with our backyard? I want to kill ALL the grass and weeds back there. Once that is done I want to lay out new dirt (dogs have dug up holes all over). Then get grass to start over again. Any ideas that are effective and safe for my Grandchildren and the dogs?