Plant a tree here, a tree there, a few foundation shrubs and let nature take its course. That's the first mistake. In landscape terms, you don't start planting before you have a plan. Another important consideration is how much space is available to you. For families who do a lot of entertaining, for example, a large patio will be needed.
Privacy is another factor to consider.
You don't want to install your spa under the windows of two-story homes next door. Check your soil type and drainage, and install drain systems from low areas of the yard where rainfall and irrigation runoff is likely. Find our where underground utility lines are for gas, electricity, telephone and sewer. Look to see where your best views are, and use low-growing shrubs and trees there so you don't block that view. Some communities have strict regulations on landscaping.