function serverCmdRules(%client){
messageClient(%client,"", "No Spamming\nWatch Your Languge\nDo Not Ask For Admin\nDo Not Ask To Load\nBreaking Any Rules Will Result In A Kick Or Ban!");
}
messageClient requires a client to message, you didn't have one listed. %client is whomever uses the function.
\n is a new line, the way you had it set up it would all be on one line.