I planted my Sweet Pea Seeds last week (9/28) while it was still Sept because I wanted to get going! Sweet Peas take so long to flower for an annual. I think I've said it before here but in case you missed it: other annuals like tomatoes take maybe 2 months from seed to flower to fruit. Sweet peas take about 6 months from seed to flower. So get going! They like a sunny spot with at least a 6' support to climb.
I planted several kinds of lettuce, spinach and carrots on Monday(10/1). I love not having to buy lettuce in the store from Nov-March or so. I haven't tried carrots in a few years because they tend to fork in my soil. But I was tempted by the seed packet of these multi colored varieties. We'll see how they do. You could also plant broccoli, cauliflower, Brussels sprouts, and beets too.
I think that lower pic is a sweet pea sprout. I hope so. It may be one coming up from last season because they usually take 2 weeks to sprout.
I've also got California Poppies that I got free from the Theodore Payne Foundation that I'm going to sprinkle in my front yard.
Fall weather is the best growing season in SoCal. Happy Gardening!