The popularity in percentage!

This goes with my last question so me i would really appreciate it

Avec les informations de la grille, faites deux enveloppes: the address to a (e) friend (e), l'autre à un auteur. utilisez le langage informatif pour votre ami (e), et le langage formel pour l'auteur

In this french correct ? i dont know if the person i am talking to is a female or male im assuming that wouldn't affect it but i kind of forget . i know all adjectives agree with the nouns that they modify. métier is masculine so i use the adjective bon and bon is masculine so i use un? is that how it works je pense un bon métier pour toi est un artiste ou un architecte. i think a good job for you is an artist or an architect