Dear Emre,
Unfortunately, we don’t have step-by-step instructions for starting with FAST. It may be helpful to review the presentations and sample models/simulations that were presented at our last modeling workshop. These are available for FAST v8.08 (not quite the newest version, but I don’t have newer materials that are so comprehensive) in my Sep 15, 2014 post in the forum topic found here: Modeling Workshops. After that, I suggest that you study the various user’s guides and theory manuals.
Best regards,