How do I build up my clan?

What realm are you in? If you are in a realm that is established , such as 10 or 12, starting a new clan will be difficult since players have no incentive to help a clan in its infancy. If you are in a newer realm you will just have to build a rapport with people or just join an already existing clan and build your brand from there. There really is not a definitive answer on how to build a clan up, just who you know and who is willing to follow your lead. Take care and best of luck.