Charlier and Thumb Cuts were the first cuts I learned, and the Sybil was the first two-handed cut. I gave up on the Thumb Cut because my thumbs were too short, but I picked it up now (two and a half years later) after my thumbs got longer. Sounds weird, but it's true.
My first flourish was, like Jack The Magician, the Charlier Cut.
My first two-handed cut was the Jackson Five.
Although I don't count the Jackson Five a flourish itself; I consider it a "sequence of flourishes"
Madonna 3, Sybilism, Skatercut, etc.
Well, that was the first sequence I learned.
believe it or not, my first flourish was 7axophone, my friend learned it and taught me right away, and I got it down with a lot of practicing...But my first "flourish" that was easy or barley even considered a flourish was charlier cut