Beginner Gardening: Filling in sinkholes with leaves and compost, 1 by Wetlandgardner

Wetlandgardner wrote:
I'd like to fill in the sinkholes in my wetland backyard with leaves and compost to enrich the soil. I've already filled them in with the leaves that just fell; now what? Do I buy soil, straw, sand, or potting soil? That sounds a bit pricey. I intend to compost using vegetable scraps from the kitchen. Would like to get the soil ready for planting trees ASAP, but realize it might take a year or so to build up the soil so it's rich and even with the rest of the yard. The sinkholes fill with water every time it rains a lot.
Thanks,
WG