I need to redo my backyard lawn and need some help, I have about 1 acre that needs to be redone. right now the grass is mostly weeds I am plan on tilling up the whole yard to remove the weeds, how deep should I go down 2-3 inches? Should I use a chemical to kill the weeds or will the tiller be enough? I have to level off some high and low spots also. After I till up the yard do I remove the weeds I have a 4 foot landscape rake to do this if needed. What type of grass seed should I use the yard gets a lot of sun but I want the grass to hold up to being played on. so is rye a good choice?