Wouldn't it be lovely if you could just dig a hole, plant your flower and forget about it? But that technique doesn't make a great garden. Give some thought to preparing your soil and deciding what parts of your landscape are going to require sun-loving plants and where you'll need to place shade-loving plants.
From that point, group your plants according to their water needs, keeping high water users conveniently close to the house. If you're planting in containers, be certain to choose plants with compatible requirements for sun, shade and water.
Your local Home & Garden Showplace expert will be able to advise you on the best potting soils, containers and garden accessories for your needs.