Hi Julie,
I am also in zone 9b so our growing environment is similar but not necessarily identical. Where and how your house is situated and what surface area you have to place the plants can differ much between us. So I can only info you in generalities and from my experience for what it is worth.
I find that it is easier to group plants according to similar needs so that maintenance is easier. Planters that you see sold in many places are put together to attract a potential buyer's eye but not necessarily planted for easy sensible care. The planter you have pictured is quite a combination of plants but the groups within have different watering needs, sun exposure needs and soil needs.
You know the saying that "all cactus are succulents but not all succulents are cactus". Your pot illustrates that. They are all succulents but the cactus within are different in maintenance needs. Even the non-cactus succulents can differ from one another in growth rate, height, sun exposure, hardiness, etc.
To simplify what to do with your very colorful and varied pot, you might consider separating the cactus from the non-cactus succulents. For example, make two separate pots. Then read up on cactus in general and see how their growing nature and needs/conditions differ from the other plants. You will find that their grow rates are much slower, they rot easier if maximum drainage is lacking, they bloom only under certain conditions. Some require a good amount of sun and very dry conditions.
Not true with the other succulents. Some can't take as much sun, don't need as much drainage, grow faster and taller or fatter, etc.
So far I see graptopetalum , (small rosettes with stems that will elongate to hang over pot) cotyledon (large flat green-only leaves) , kalanchoe (large flat leaves with red outline), Blue Chalk Sticks (elongated blue finger like leaves that bunch and stand up), euphorbia (triangular, flattened stem, med-dark green), aloe (spiky elongated arms with mottled blue white coloring) and various cactus (straight spiky and curved spikey) that I am sure other ATPers can ID for you.
