Welcome to the Tutorials, my friend.
First, let's get the big thing out of the way.
Approximately 90% of this wiki is considered to be in-character. Quite simply, if it is not a tutorial, the name of a wiki category, the stuff in italics on the front page or clearly stated (BY AN ADMIN) to be OOC, you may assume that it is IC information. This includes character profiles and any information regarding factions, locations or history.
However, take note that due to the IC nature of the wiki, omissions and inaccuracies are to be expected. The articles are written by mere mortals, not all-knowing deities as the previous story wiki's seemed to suggest. This also means that your own articles are "written" by a 3rd party, so whilst you're writing your background keep that in mind. What would an individual know about you based on researching official documents? It is unlikely they would know your deepest motives unless you carry them on your sleeve, after all.
Now, with that out of the way, feel free to head to the pages below to become accustomed to the information required to get started with Amaranthine, both OOC and IC.