In Order TO Become A.......

Student: Join the Academy. [Therefore; the roleplay/forum]

Genin: Pass the academy final exam. [Basically; fill out a description of your bio and be accepted]

Chuunin: Pass Chuunin Exam.

Jounin: Pass Jounin Exams.

Ninja Councilor: Your ranking must be Jounin or higher.

Sannin: Appointed by Kage.

Kage: Appointed by Council [Mostly by the decisions of all admins/mods]

Medical Ninja: Medical Training Camp. [If you're already skilled, then it's automatic]

ANBU: ANBU Training Camp. [Normally, the admins pick the best for the job]

Hunter Ninja: Hunter Training Program.

Missing Ninja (S-Ranked Criminal): Piss of your village learders! [Or; even if you try to attempt to kill your own shinobi of your village]