To provide the most helpful guide, I will assume you are looking for a comprehensive guide on in Toontown Rewritten, with a focus on advanced gameplay ("PP" implying Peak Performance or Power Playing).
To get a precise answer:
This is the most critical decision for a "Power Toon." You get to choose 6 out of 7 available gag tracks. You must drop one. Which one you drop defines your endgame playstyle. pp toon