Blueberries thrive in acidic soil, pH around 4.5, with full sun, and consistent moisture. Do you live downwind of a volcano? Do you have neighbors, and if so, what sort of vegetables do they grow? If you have hard water, then watering will tend to raise the pH of the soil. What is growing in your yard as we speak?

I know blueberries will do well in most of that soil, but I REALLY want a nice little kitchen garden, although I wouldn't mind a nice blueberry bush. In a sense I do live in a caldera, at least in the summer (central AR summers are miserably hot and humid). My neighbors across the street are the only ones I've noticed who grow a garden, and theirs is primarily of ornamentals (roses, etc). The current naturally growing plants ("weeds" in laymen) are mostly clover and a bamboo screen that is very well established. I've read that bamboo thrives in acidic soil, and I suppose this explains why. Is it making it more acidic? Can I sheet mulch and just hope for the best? I really want to do a Three Sisters patch and grow lots of tomatoes. I've also read that wood ash can help increase soil pH. What are the most effective methods of applying these?

There are several extinct volcanoes in Texas, and your soil may be based on volcanic ash from that source. Your acid soil is likely to be many feet deep, so there are two issues: 1-raising soil pH so you can garden and 2-keeping the garden soil from reverting to acid pH. Wood ashes will raise soil pH, but agricultural lime is the method generally used. Most garden plants do best at pH = 6.5. I can't say exactly how much lime to put down-my experience is with using sulfur to lower the pH of our alkaline soil, exactly the opposite problem.

What was used to do that soil test?
If done by a reputable soil testing lab there should have been recommendations on how to raise your soils pH to do what you want to do. Wood Ash can raise your soils pH quickly and for the short term, but for long term change you will need lime, either calcitic or dolomitic depending on what your soil needs.
Adding adequate amounts of organic matter may well buffer your soil enough so the pH is of little concern, but that is still a months away process.

I used the cooperative extension office for my soil test. They didn't specify which type of lime to use, only to use 92 lbs/1000 sq ft (or 69 for the section that is in the pH 5-5.5 range).
When I apply the lime or the wood ash, does it need to be diluted in water? Should I agitate the topsoil?

You should mix it into the topsoil before mulching.

Did you test for Ca and Mg? If so what were the numbers? That will help determine what kind of lime to use.

If you have wood ash available, you can use it but it's much stronger and faster acting than lime.