Good Evening NikkyP,
That someone you talked with is 100% correct. Go to work. My flavorite is garlic. Plant a good variety. Try to get a variety from Gilroy, California. They have the best. Their festival draws over 100,000 people from all over the world. Great garlic is excellent for cooking and easy to grow. Do not plant grocery store garlic. Don't forget onions. I plant onion bulbs. You can find them in the nursery. They are about as big as a marble.
http://www.garlicfestival.com/
Carrots, made sure your soil is loose from a good mulch. I use homemade compost. If you have children, they love baby carrots. Let them grow about two or three inches, and have the kids pull up the carrots themselves. The carrots will be sweet and tender. This is their best time of year in So. California.
Brussel sprouts will come out beautiful. They are slow growers.
I do not like growing lettuce this time of year. They get to many insects. I am getting to old (smile) to work that hard. You see, I do not use any chemicals or pesticides on my vegetables...never have and never will. In fact, I hand picked two green worms on my collard green tree this morning. All the leaf vegetables will also do great.
Many gardeners from other areas will not understand So. California. My tomato (total six; two yellow, four red) plants have about four red and thirty green tomatoes on them, and they are still blooming from this spring. I will replant others again this spring. I did pull up my eggplants this morning.
We can a lot of our vegetables. That is about all I can recommend right now. Everything will do great.
I have been a gardener for sixty years with written records of the last twenty years. What a great state to live in for a gardener. You should take advantage of it.
You have a great day and a beautiful holiday season, from Los Angeles.