Dear Josh,
We typically offer workshops on FAST and other wind turbine design tools 1-2 times per year (locations varying). The last workshop was held in March under CREW in Colorado. More information – including the presentations and sample simulations that were given at this workshop – are now available from: NREL/CREW Design Codes Workshop in Boulder, Colorado (USA).
Until another workshop is scheduled, the best way to learn FAST would be to review the presentations and run the sample simulations from the link above.
Happy modeling,