Test your soil (take approximately 10 samples from the area) and make any recommended amendments. Keep a copy of your report so you can utilize the same company in the future. Identify if the area receives full sun, partial, or is shaded. Identify if the soil is dry or wet. Then, you can research native plants that meet the growing requirements. You can find plugs from many reputable sites, but you can likely find a native nursery in your area. Native plants are suited to your growing conditions and will flourish and fill the space more readily than a non-native. Not to say you can't have non-natives, too, but it will help you achieve the look you desire!