Wow your question is really several questions in one. In order to provide you with more information than we can fit in this brief answer, let me refer you to the following web sites, which should be very informative and useful to you. They will give you much more information than I can fit in this brief reply.
Recommended trees and other plants for your area:
You can also contact your Dallas County Extension Office for free information on establishing and caring for a lawn. Their contact info is:
10056 Marsh Lane Suite B-101
Dallas, Texas 75229-6071
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