In a way it seems easy. A naturescape must be developed. Once the natural habitat takes root, then nature takes care of itself. But you must first get to that point. In general, a naturescape must include safe shelters for wildlife.
Shelters take many forms, and allow wildlife to rest, escape, retreat and raise their young.
Examples include thickets, hedges, logs and long grass. Food sources are also required for a natural habitat. Vegetation that produces food in the form of seeds, nectar, berries and insects should be considered. Supplemental bird feeders may also be useful. Clean fresh water is a must.