Well basically the way this works is the mod team had constructed a long lasting campaign that is currently taking place in the hidden village of sound. It is designed to give players an interesting experience while still allowing them to shape the storyline according to rp.
For example, right now we are all in the sound village academy practicing rope tying. This comes with its own checks, similar to the way DC's work in WoTN. As the campaign continues we will go on missions, fight in battles, join together as genin squads etc. Think of it as a table top rp where the mods are the DM's and you are the players. Except in this case, rather than have a story completely be shaped by the DM, the player is given the freedom to decide their own actions as well as discover their own ways of tackling a challenge. It is also designed to accomidate for new players who do not yet know the ins and out of the system. If you participate it might be a little confusing at first, but I guarantee you that if you stick through it everything will start to become easier and easier.
For now I suggest you start
here. This thread gives you the basic information you need to enjoy the guild. I will note however that the section about combat may be a bit overwhelming, that is understandable. You should focus mostly on understanding: Training, Stats, and Chracter Creation. The ins and outs of combat will be introduced and taught to you during the campaign.