To get started with omoa I recommend using the Flashdevelop IDE (FD). First, make sure you have Java installed. FD requires Java to run the AS3 compiler.

Download the latest version of FD. The installer will download the free Adobe Flex SDK for you, if you check the appropriate box in the installer.

Download an omoa release or check out the current development trunk from the repository. In the examples folder you will find some example Flashdevelop-Project files.