Austin area recommendations for planting trees?

I need trees! There are areas of my yard unprotected from the intense blistering scalding ETC sun and scorching any attempts to plant other things or keep things alive! I'm a senior, so may be a bit delusional about time frames for any relief LOL. But sure want to try. However, it's so hard to get good advice on what to plant, or where, etc. I'm looking for good recommendations re planting trees and what types to put where. Moon Nursery had exorbitant pricing!! I am looking online at Trees.com but would really like to find an Austin area resource, maybe consultation too. And/or suggestions on types of trees to try. FYI, I did plant an approx 2 ft? Mexican Sycamore I bought from Lonestar Nursery when about half that size, and am trying to keep it alive with drape for shade and water... But would need help to dig bigger holes for bigger trees! AND, I managed to kill a Desert Willow I got on sale a yr or so ago... it seemed ok and growing, but then had a hard time thru the winter/freeze and then just started dropping leaves despite all my attempts to save. Don't know why it died. Anyway, all suggestions/recs appreciated!