http://www.xiledgaming.com/forum/showthread.php?p=667092#post667092
That link will take you to the requirements for ranking up in XG,
However the best advice i can give u is try to help others before yourself, do thing without having to be asked to do them. like go and recruit and get members into your clan without your captain and general asking you too.....
Another good thing would be to follow your captain around and shadow them and see how they run things this will kill two birds with one stone, it will show you what u need to do in that position, and it will help you get to know your leaders in the clan.
But yea go read the link i sent you and try to follow that, but understand that it is not a perfect guideline, its just an example on things they are looking for when they are getting ready to promote someone