Tilling of the Soil

So, I found a spot on the north side of my patio underneath the grapefruit and orange trees to plant my garden. There's also the a/c unit in that space, too. The soil is hard as a rock because it has not been tilled in ages! I began by soaking the ground and then the next day while it was still very cool in the morning I got the shovel and started turning the soil. I found out that this soil is called clay soil and needed a lot of prep work to ensure strong healthy root growth. I went to my local Lowe's and found some bags of soil enhancement material. (I'll have to look at the bag again to get the proper description :) ) After combining it with the soil in the ground, I watered the area really good and then planted my first plants - tomato, zucchini and bellpepper plants.