Well, its too easy , well first you need to create the ranks if you want, to put the commands or permissions. Obviously you need to have bukkit if you want to do that, thats the basic. [If you are paying for a server, you need to access to the ftp of the server.] Go to the PermissionsEx configs that is on the plugins folder on your server, then you need to config all the access and permissions too. Well, I do not want to confuse you, look this video, you need the permission plugins :
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