This information is posted in The Shire, in a thread called
READ THIS BEFORE YOU POST: The Red Book of Westmarch . I think Pio wrote it or most of it. Anyway there are some good basic guidelines that will help avoid Mary-Sue-isms, and here are some of them:
WEAPONS (No magical, super-hero, mithril weapons, implements, or jewelry. Just good solid Middle-earth weapons and armor only that is appropriate to the race of the character and the time period.):
PERSONALITY/STRENGTHS/WEAKNESSES: (No half-Elven characters. No mixed-type characters. No super-heroes. No assassins. No one all powerful, martial arts proficient, or having any magical traits. Just regular characters with normal abilities for their races only)