Your local government should provide sand, check their social media. Remove things from your yard. Go buy essentials. If you lose power keep your fridge closed as much as possible. Don't try to drive through flooded areas. Stay safe :3
We get both flooding and high winds in LA fairly regularly, just usually not both at once. If I was planning to be out driving or walking around in it I might be worried about it, but I don't live near a flood zone or a mudslide zone. The biggest risk to me is something hitting the windows, which can happen during the Santa Ana winds anyway (and hasn't yet).
The "year's worth of rain" is mostly clickbait that applies to certain desert areas of LA county. For my area this won't even be the rainiest day we've had this year.
I'm not unfamiliar with the havoc hurricanes can wreak, I grew up on the east coast and have been subject to them. But the west coast isn't the east coast flipped backwards, the cold ocean here takes the steam out of hurricanes to a degree that you don't really see on the east coast. Right now in San Diego the water temp is 65 F, and hurricanes rapidly lose strength below ~80 F.