with all the info I see about composting, I have two basic question I can't seem to find answer to. #1 when composting to small container like a tumbler or such. Do you add all your material at one time and then compost or can you add additional as you go along? If you do add additonal, how long and how much additional can you add and when do you stop. #2 If you don't add additional to a started mix what do you do with the poop before. Just keep it in a garbage can or what and can you get a prestart by adding grass clippings to it?