Welcome! Before getting started, be sure that you download and install OpenFL.
If you are already familiar with the fundamentals of ActionScript/Flash development, go on ahead! If you have never developed using ActionScript before, OpenFL builds on many of the same concepts, so looking at the ActionScript 3.0 Developer’s Guide will provide a good introduction to using some of the key classes and APIs. There is also an adaption, the OpenFL Developer's Guide, which is under development.
If you still have questions, or are having trouble with OpenFL, please visit our friendly community forums, we'd be happy to help you!