Here's the basic idea of my directory.
To have the player's name, FC, region they are from, self assessment of skill level (1 being thinking the controller is a TV remote and 10 being Azen or M2K), are they willing to teach (yes or no), if so, a self assessment of how good they think they are at teaching (1 being getting confused on how to put the game disc in the Wii and 10 being someone who taught many successful "students"), Top three characters, who they main, characters they are most comfortable teaching, days they are mostly available, highest tournament ranking
Here's what mine would look like:
Name: Fatmanonice (FMOI)
FC: 3007-7993-3724
Region: Midwest
Skill Level: 7/10
Willing to teach?: Yes
Teaching Level: 8/10
Top three characters: Mario, Ness, and Wario
Main: Random
Comfortable teaching: all characters
Days available: Weekends
Highest Tournament ranking: 3rd out of 64, Electric Schuffle, September 2008
I may add more categories as I see fit but I think this could act as a decent reference for people who are looking to improve or simply want a challenge.