For each clan, there are a set of clan rules. Rules of EE are posted on the rules tab. New rules come in when they are passed by one of the council members.
For each rank, there are restrictions. These restrictions are posted on the restrictions tab. As you rank up in EE, you will have less restrictions. You rank up by paying much tribute to EE or fighting in clan wars. You also rank up by recommending a lot of recruits.