What is the best cost/easiest way to do/redo my backyard?

As you can see in the picture our backyard is just a big square of dirt. We live in South Florida and I would really love to have a nice backyard preferably with a screen enclosure.(But a full project is hard to afford). Unfortunately my husband is not the most handy so we need something not very difficult to DIY. Thank you!
q what is the best cost easiest way to do redo my backyard
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