Hey San Diego!
I live up in Orange County and have many cascading cyms living outside all year. They love our climate and do well with temps 30-100 degrees. I've had success with mine potted in a mix of coco chunks and Aussie Gold. (basically coir, perlite and diatomite) Cyms are semi-terrestrial so regular potting mix holds too much water and just orchid bark won't hold enough. If you have only one plant, you can get away with coco chunks (or generic orchid bark, tho readily available it's not my favorite to plant in)
AND a little sprag moss mixed together. If you use coco, rinse it-drain it-rinse it-drain it 3 or 4 times to get the salt out of the stuff. Cym roots don't tolerate the salt in many coco brands. Cyms do not like to dry out between waterings, and be careful with the Santa Ana's; they dry out your medium real fast! I find great pre-made mixes at farm supply stores also, all ready to go in one bag. My favorite is called "New Age Gardening" orchid mix; it has a little bit of everything that is hot in orchid mixes right now! All the orchid geeks have their favorites and many will work, just keep in mind what part of the country (or world) the advice is coming from. Especially pay attention to humidity because mixes retain water much differently in various climates. I think that will get you started!
Also, welcome to the forum! You'll get lots of great advice here.
VERY important - wait until your plant is finished blooming before you re-pot! If you re-pot now you will stress the plant and likely lose your spikes. Cyms love to be potbound so it will do fine in the crowded pot it is in for now.