I've been reading a lot on the net about composting. It seems you mix 1 part green(grass,manure,weeds) & 2 parts brown(leaves,sawdust,straw,etc). so you just put the brown on top of the green right? will this compost faster than just a pile of manure? how do you know when its ready to use. My yard is clay & my grass is thin w/ bald spots, so i want to try to help the whole yard. i can get manure & sawdust free, so is that all i need to do, just mulch it & spread it. I see people talking ph & gypsum, where do these come in to the process?