I lived in Woodland Hills for a number of years, and also in West L.A., Santa Monica, and Hollywood. It's been a long time, but as I recall, winter temps at night could get down to around 40º F. at times. Some herbs, cilantro is one, enjoy cooler temperatures, so would probably be a good cool-season crop for you. Cilantro has a taproot, so use a deep container. A 5-gallon bucket might be a good size/shape to aim for.
Cayenne is a type of pepper. Peppers like warm temperatures, so you'll probably want to grow them in the summer. You can find a lot of excellent information in our [url=https://www.helpfulgardener.com/forum/viewforum.php?f=4]Vegetable Forum[/url] about how to grow peppers.
Once your oregano is started, I think I would wait until spring to plant it outdoors. Once established in your outdoor container or garden, it can stay outside year-round.
I've only grown flax for its flowers, and I didn't grow it in containers. Just my opinion, but if you're growing it to use the seed (I use a lot of flaxseed meal; golden is my favorite.

), then I think you will need a
whole bunch of containers! It would probably be better to plant it in the ground in the early spring. The flax grown for seeds is an annual. Be sure you buy the right kind of seed, not the kind grown for the pretty blue flowers. You want
Linum usitatissiumum and you might have to buy it online or from a farming supplier.
Sorry my info is so limited. I'm sure other members will add some great advice.

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