All the Ninja who where regitered Yesterday this does not effect them.
Academy Student
Post: 0-50
Genin
Post: 50-155
Chunnin
Post: 155-255
Jonnin
Post: 255-750
Kage
Post: 750-1000
To be a Clan leader you must be Chunin and have at least 200 posts and must challenge and beat current leader
You must reach the second number to go up a level. Just like in the show you will have to pass test and go through the chunnin. If going for kage you must challange the current kage of that village you want.