The first thing you need to do is learn a little bit about flowers in general.  You need to learn the difference between annuals and perennials, for example.  Annuals need to be replanted every year, but perennials keep blooming year after year.
 
Always be sure to plan your flower garden carefully.  You must choose flowers that [...]

If you’re going to start a butterfly garden, you’re going to need to choose some flowers and plants that will attract them.  To do that, you need to choose varieties that are common food sources for a variety of types of butterflies.
You’ll need a pretty wide variety of plants that bloom continuously all summer, and [...]