Step 0. Unzip the file.
Step 1. Start Flex Builder (I use version 3)
Step 2. Flie/New/Flex Project
Step 3. Name the Project main and click Finish
Step 4. Open the unzipped main.mxml file in some
editor/NotePad & copy everything and paste it into Flex Builder
in place of the default code.
Step 5. Copy the components and pkg folder from the zip file
into the project and paste the into the Flex src folder.
That will let the project get build, there are some other
resources needed to really run it but hopefully that info is at the
place where you got the zip file.
Good Luck, I too am a beginner but am enjoying learning Flex.