Marguerite, Basically, my heap is a heap cause I just let nature take it's course with it. I just don't have the time or the yard space to do what I really want right now. The size of my heap is about 3.5x3.5 and by no means as big as I want. I end up throwing a bunch of the kitchen scraps away as well. Another additive that I use is ash from my smoker and my grill, two separate sources of ash. In the grill, I burn scrap lumber from the remodel that has been an eternal project. I don't bother to pull nails, I just load it up and burn it and all the scraps, including nails, goes into the heap. Burnt nails add a source of iron and a few other metallic nutrients. Believe it or not, I was taught in Horticulture classes that when planting a tree, especially a fruit tree, throw lumber scraps, sweet and common nails and whatever else you can get, other than plastics and rubbers, into the bottom of the hole. Sweet nails give a source of zinc whereas commons are a source of iron. The break down of these from the originating source is so minor that you don't have to worry about toxicities. I discovered that I had a much better break down of the material in my heap last year and the only two things different was that there was less greenstuffs and kitty litter was added. I've increased the amount of kitty litter this year, so, I will know more in about 2-3 months when I go out to screen it. Shoot, I've not even turned it this year and there were limbs of 2 inches in diameter in the bottom. I do know that I've never had problems with breaking down rines of various fruits since using kitty litter. As far as starting a heap, the best thing I can recommend is start 2 or 3 and compare how they work out. I've done nothing special other than add soil when the temperature is too low in my heap during summer months when it gets dry. You need to be sure and keep your heap moist to keep the temperature up. Not saturated though. There is a wealth of information available on composting. Might contact your states environmental protection agency and see if they have this info. Here in Texas there is a major push for recycling and we even have rules for commercial composting facilities. In fact, you can check at www.tnrcc.state.tx.us and see if there is any information on that page. Also, that is the place of my employment. :-)) I'm a regulator, one of the bad guys in the black hats. Hope this helps. If you have any other questions, just ask and I'll try to answer, if not, send you where you might hopefully get some answers. Thanks for the site, it is bookmarked. Thanks Paul Reynolds Austin Texas