Up to you. I think my first or second match in IDPA was a classifier at TCSC and I qualified Sharpshooter in SSP with a pistol that fits in CCP these days. Even if you don't do well at the first one you will understand what skills you need to practice.
the classifier is actually a great first match. no running around or any of the added pressures of a regular match - just focuses on the fundamentals - advancing, retreating, strong hand only, weak hand only, reloads, shooting around a barricade, etc.