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We will use an existing FlexJS example to start and play with, DataBindingTest from he <FlexJS SDK>\examples\DataBindingTest, so, in IntelliJ:
1- Create a new project:
Flash project
2- Tick "Create sample app" and enter "DataBindingTest.mxml"
3- Untick "Create HTML wrapper template".
4- Select the Apache Flex SDK you have downloaded, in the illustration, I choose the Apache Flex SDK 4.10.0
If you don't have yet configured in IntelliJ a SDK, you will need to create and select one, see the above illustration
5- Name your project DataBindingTest
6- The project will open, IntelliJ will index the SDK files, wait a bit and got to file/project structure, then module and dependecies, you should see something like the illustration below
7-