Hi Monica -
When you say Central OK, where is your nearest town, that would give me an idea on what help you might find.
Oklahoma is in the Cross Timbers so
land that is in Tulsa will be quite different than OKC area. I'm guessing you are more like OKC land so you'd need to plan for sandy and clay soil - so I would suggest amending soil be a top priority. Things you could thing about is making
Hugelkultur beds, especially if you plan to remove
trees (though I'd keep however many you can, and don't bother using red cedar in
Hugelkultur - I'm not sure it would rot quickly).
Most of the bigger cities have some sort of dump for trees and clippings that you can access for free. I'd check into that as you can use it to make beds or to start augmenting soil.
We also get very hot summers and a friend of mine who was living in Mannford had to plan for some filtered shade by the time July and August runs around even for full-sun plants. Full-sun in Oklahoma will burn your face off!
We also have a problem with having warming weather and than a late frost. If planting flowering trees or bushes, I'd chose ones that flower as late as possible in the spring.
Willing to help - though not a master, only a beginner. Although I know Oklahoma very well from living here a long time.
Becky