You can get some compost from DPW/Fort Totten Sat. 8-3. The current mix is very soil-like in composition, with small twigs mixed in. You could definitely get at least a few yards there. I’m no soil genius, but I would mix the stuff with some peat, perlite and potting soil, along with some wormy home-compost and go with that. If you aren’t trying to grow edibles, I would till in the mucky clay you probably have in your front yard, and that should be pretty decent.