The burst of nitrogen is lethal to many of the invertebrate associates of the microbes in a healthy compost system. If you've got a big pile of leaves like that and no way to turn such a pile efficiently, I wouldn't add any greens and let the leaves break down by themselves over a year's time. Leaf mold is great stuff. To make leaf mold all you need is leaves and moisture and maybe a tarp to keep the pile from drying out in warm weather. You don't even need to turn it.
Fungi do the work.
Turning that much material by hand is probably more than you want to bargain for. If you have a front end loader that's another story. So back to my original suggestion, I'd let it sit for a year. I'm doing some leaf mold experiments with different types of leaves. We have a 10 x 12 x 6 area we store leaves for summer composting.