1 - Bring everyone together to work as a Collective.
(Merge teams if there are multiple.)
2 - Throw your work on the wall.
(Visually represent business goals and work.)
3 - Have a meeting where the Collective self-organise and self-select into teams.
4 - Work (which includes breakdown).
5 - On a short cadence, meet back together to synchronise.
While together, kick off the next cycle by again self-organising and self-selecting into teams, i.e., go to step 3.
The best resource to find out more about the FAST process is over at the FaST Guide.