Hi David,
Depending on the size of your compost heap, dead /dry leaves and a shovel or pitchfork will do the trick. If the compost heap is fairly small, simply turning the contents with a shovel/fork will keeps things aired. If it is a closed barrel or drum, tipping and rolling the drum will work. If you are adding newspaper, it is best to tear it into strips rather than just heaping the paper in as the strips mix more easily. We use a shredder for personal papers and add them to the compost also.
If the compost is kept in a barrel with an open bottom, you might consider a second barrel or bin and move the compost between them to keep it aerated.
