Feed the soil (not just fertilize the plants) by adding compost and other organic materials is one of the primary building blocks. Start by having a soil test done. Contact your local Agrilife Extension Service for an office in your county. This will give you a starting point for improving the native soil in your intended landscape / gardening area.
Plant a variety of native and adapted plants in your landscape. They require less water and fertilizer. Explore the resources of your local Cooperative Extension Service for more information.
Create a landscape that not only looks good but is good for you and all the wildlife around you by limiting use of pesticides and herbicides. Nurture beneficial insects with native and flowering plants since they help keep problem insects under control. Encourage birds, bees and butterflies by offering sources of food, water and shelter.
Grow some of your own food. Start small with a few of your favorite vegetables and/or herbs. Delight in the richness of flavor in a freshly harvested vegetable or herb.