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They will require cold stratification to germinate. Keep them in your refrigerator until you are ready to plant, since they normally grow in colder regions.
You are in zone 9, so you may find that they die off in the summer.Just make sure to plant them in the shade since they cannot handle direct sunlight at all.
When you cast them out under other plants, or in a fully shaded location, then you will only need a light dusting of soil to cover them. Keep the soil misted, and moist but not soaking wet.
This article will help you grow these:https://www.gardeningknowhow.com/ornamental/flowers/skeleton-flowers/how-to-grow-skeleton-flowers.htm