Let's start off with where you are: Phoenix metro? Other part of AZ? Makes a difference.

Not the time for peppers or tomatoes (although some of us are trying for a fall tomato from transplants). It is the time for cool weather crops, e.g., greens, lettuces, brassicas. This is one good planting calendar.

Here is a link that might be useful: planting calendar

I am in central Phoenix. What is a brassicas?

It's a big list of veggies! Lots of my favorites, perhaps some of yours. They all do well in fall gardens.

Here is a link that might be useful: brassicas

I am a little north in camp verde so I can't plant as many things as you can. Lettus is a good start, maybe some garlic, carrots. I by my seeds every where even the dollar store but my favorit is "Seed savers exchange" www.seedsavers.org. They have a "free" cataloge with pictures of everything. Once you request a cat. they will send a free one fall and spring. Its like looking @ the sears xmas cat. when you were a kid. They also sell onion sets and potatoes starts. They must sell 35 diff. kind of bean seeds just for starters. As you can tell I like them. This year I planted heat resistant eggplant seeds. White eggplant w/purple stripes. Cool.