Answer: You can remove the rocks and plastic and then rototill or dig the area to aerate it. Being covered with black plastic for a period of time will essentially sterilize the soil so you might also want to incorporate some organic matter such as compost or aged-manure. Dig it in to a depth of 8-10 inches then level the area and plant your squash and cukes. After planting you can spread another 2-3" of organic mulch material over the bare soil. At the end of the growing season simply turn the mulch over into the soil. A few years of this practice should produce some wonderful garden loam.
Hope you have a bountiful harvest!
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