I drilled a quarter inch hole in the bottom of each bowl and added about a half inch of pea gravel. I put just a bare1/2" of cactus potting medium over the gravel, then placed the root ball of the little succulent on top. I filled in carefully with more cactus medium just to cover the root ball. I watered it very carefully, just dripping a little at a time and making sure it drained quickly. I then added more gravel on top of the soil as mulch and to protect the plant from splashing soil when I water. I set the bowl in a 4" drip tray with about 1/2" to 3/4" of gravel in the bottom to further insure good drainage.
They now have a new home on my sofa table in our very bright passive solar living room. I just need two more for the other two salad bowls. And then maybe some trailing succulents for a hanging basket...I think I may have a new gardening addiction.