I am a new member and new to gardening. I am a killer of plants! (Confession). I live in Texas… almost in East Texas… I need help planning a Fall garden. Size to be determined by input/advice. It is just us two living here. I am absolutely NEW to gardening. We are in zone 8b if that helps. Recommend a good book(s) to start?
hello from mid-Michigan and welcome to TEG.

i will recommend your local library for as many books as you care to read, i don't have any favorites because there are so many with different methods and opinions, plus you are further south and have a longer season than here so things i would do don't work the same down there.
there are a lot of east Texas gardeners here on TEG.
for a new gardener it is really tempting to go big and then get overwhelmed, my own advice is to plant enough diversity so that you will get some results, but to make sure to plant things that you know you like to eat. there's nothing more discouraging than to plant a lot of something and then finding out that nobody else will eat it.
usually easy crops are things like peas, pea pods, cucumbers, radishes, turnips, chard. it might be too hot right now for your area to start any of these so just getting the garden area figured out turned.
how much light it gets is important.
fence will also likely be important - around here without a fence we'd likely not get much results. because of deer a minimum height is 6ft, 7is better with another foot or two turned outwards at the bottom so the diggers won't have it easy to come under. keeping a fence clear of weeds and vines is also important through the years. a plant growing on a fence provides a lot of surface area for the wind to push against so i've found out that keeping most plants off the fence will keep it from being blown over. if you have a big enough garden you may also need to put something on a wire fence to make it more visible to deer so that they don't try to run through it.
personally i have a preference for in the dirt and on-the-ground-level gardening where the pathways are not a fixed part of the garden, but can be moved as you rotate your spaces each season. i also am not a big fan of raised beds, but we do them here because we get flash flooding. through the years i've found out that edges are work so i prefer as few of them as possible. but keeping a good edge along a garden will keep a lot of weeds from getting into the garden.
my favorite gardening tool is a stirrup hoe, you need to use it, but regular scraping of the surface will keep many weeds from getting bigger. when it gets hot it is important to get out early and get it done before it gets too hot. keep hydrated and siesta during the middle of the day. putter around later on if you can.