Purpose of clans: As others have said, a clan is a community of people going after a same goal. That is to have fun. Some clans do organized monster hunting, some do skilling, however the majority of the clan world does F2P warring. This requires high stats, teamwork, and determination. The big league warring is in PvP while the smaller clans likes to fight in clan wars arena. Some people say clanning is a completely different game from normal Runescape. I would suggest you join a smaller clan to test everything out, once you are ready and know what to do, apply for a bigger clan. Here is the obligatory join PKM.