Turn this layer of compost under with a spade, or let the earthworms do it for you (which will take up to 6 weeks). If you have poor soil, I recommend that you create a raised bed by mounding Mark’s Choice Premium Flower and Vegetable Garden Soil higher than grade to achieve good fertility and excellent drainage.
The second most important piece of advice that I can give is to locate your veggie garden in as much sun as possible. Except for leaf lettuce and spinach, your vegetables require as much sun as you can give them. Most vegetables and herbs need no fewer than six hours of sunlight a day. If possible, plant your vegetables in a south or west-facing location.
If you have enough room to plant your vegetables in rows, orient them north and south, and plant the tallest vegetables at the east end with plant heights decreasing toward the west end. This way, the tall plants will not shade the shorter plants later in the day as the sun moves from east to west.
Water your new planting deeply, and as the plants become established gradually pull back on the frequency of watering. Be sure to allow the soil to dry about 3 to 5 cm. deep between water applications after the plants have become established.