First things first, visit this page for instructions on making your character.
Be sure to read this page thoroughly, almost all the info on it is important for making your own ninja.
To join a faction look at your options here before talking to an admin on the subreddit about joining one!
Look at the different clans available to be a member of here - or even make your own! (Be sure to give it it's own page if you do so, and have it follow a similar format to the others)
As you role play and your character develops, visit this page for simple instructions on what to do to improve your character.
Look here to see some other players' characters, and try not to clone them!
Etiquette and fair play are important in role playing! Check out Nafarias' Guide to Roleplaying Etiquette for some guidelines and rules to be aware of.
There are also some important explanations on how combat and certain abilities work here, and an important page on assigning costs to your jutsu and how this works in combat.
Our guidelines on earning QP should also be read - this will tell you how to earn QP, which is used to purchase feats that enable your character to learn more abilities and advance through ranks.