Help me with a code

Hi, i'm a beginner in this domain.
I'm making a little plugin to train me but i don't know how to do to make a list of rules for example with pages.
Now I have this:

PHP:

public function onCommand(CommandSender $sender, Command $cmd, $label, array $args){
       if($cmd->getName() == "regle"){
      $this->args = $this->getConfig()->get("regles");
     $sender->sendMessage($this->translateColors("&", $this->args));
     }
     return true;
   }


Someone can help me?
Thank a lot

PHP:

public function onCommand(CommandSender $sender, Command $command, $label, array $args) {
switch (strtolower($command->getName())) {
case "MAINCOMMAND":
if ($sender instanceof Player) {
if (!(isset($args[0]))) {
if ($sender->hasPermissions("PERMISSION.PERMISSION")) {
$sender->sendMessage("YOUR MESSAGE");
return true;
} else {
$sender->sendMessage("You don't have permission");
return true;
}
}
$arg = array_shift($args);
switch ($arg) {
case "2":
if ($sender->hasPermission("PERMISSION.PERMISSION")) {
$sender->sendMessage("This is the command '/maincommand 2'");
return true;
} else {
$sender->sendMessage("NO PERMISSION");
}
return true;
break;
case "3":
if ($sender->hasPermission("PERMISSION.PERMISSION"))
{
$sender->sendMessage("This is '/maincommand 3'");
return true;
} else {
$sender->sendMessage("NO PERMISSION");
}
return true;
break;
}
}
}
}

Hope it helps.

I'll try it in 1 or 2 hours, when I come back home

It doesn't work for me :/