Hi I need advice. I have just had 11sqm of concrete pathway 4inches thick removed from my backyard which will now become a garden bed. Below the concrete is about 3 inches thick of sand before reaching clay soil. How should I prepare the soil for plants? Originally I was going to lay about 4inches thick of chip bark mulch and leave till next spring before planting. What do you recommend? Appreciate advice as am new gardener and want to ensure the soil is well prepared for my plants. Kind regards Kelly