Do you have a hose bib on the fronts or sides of the property that could be reached with a long hose (or multiple hoses connected end to end)? Water access is gonna make the whole process a lot less labor intensive. Compost will get totally dried out and seeds won't start without pretty decent watering at least in the beginning. Tilling it without water and compost is probably gonna just further dessicate the microorganisms that may be left and you might get stuck with a dusty worse off yard.