Bukkit event help

package event.main;

import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.World;
import org.bukkit.block.Block;
import org.bukkit.block.Sign;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.configuration.ConfigurationSection;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.block.SignChangeEvent;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.plugin.java.JavaPlugin;

public class Event extends JavaPlugin implements Listener {

    @Override
    public void onEnable(){
        getLogger().info("Scoreboard plugin has been Enabled");

        this.getConfig();

        this.getServer().getPluginManager().registerEvents( this, this );
    }

    @Override
    public void onDisable(){
        getLogger().info("Scoreboard plugin has been Disabled");

        this.saveConfig();
    }

    @EventHandler
        public void onSignChange(SignChangeEvent event) {
            Player player = event.getPlayer();
            String[] lines = event.getLines();
            if(player.hasPermission("event.sign.join"))  {
            if(event.getLine(0).contains("[join]")) {
                if(!lines[1].isEmpty()) {
                event.setLine(0, "§2[Join]");
                player.sendMessage(ChatColor.GREEN + "Join sign created!");
                }else{
                    player.sendMessage(ChatColor.RED + "Please set a valid arena name on line 2");
                    event.setCancelled(true);
                }
                }
            }
    }

    @EventHandler
    public void onPlayerInteract(PlayerInteractEvent event) {
        Player player = event.getPlayer();
        Block block = event.getClickedBlock();
        Action action = event.getAction();
        if(action == Action.RIGHT_CLICK_BLOCK) {

        if(((block.getType() == Material.SIGN)
                || (block.getType() == Material.SIGN_POST)
                || (block.getType() == Material.WALL_SIGN)
                )){

            Sign sign = (Sign) block.getState();

            String textFromSign = sign.getLine(1);
            ConfigurationSection section = this.getConfig().getConfigurationSection("root.arenor");

                if(sign.getLine(0).contains("[Join]")) {
                    if(section.contains(textFromSign)) {

                        Bukkit.dispatchCommand(player, "arena" + sign.getLine(1));

                    //String world = section.getString("world");
                     // double x = section.getDouble( "x" );
                    //  double y = section.getDouble( "y" );
                      // double z = section.getDouble( "z" );

                       //player.sendMessage(ChatColor.BLUE + wCoord);
                       //player.teleport( new Location( this.getServer().getWorld( world ), x, y, z ) );

                    }else{
                        player.sendMessage(ChatColor.RED + "That arena does not exist");
                }
                }
            }
        }
    }

    public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args)
    {
        if (!(sender instanceof Player) )
        {
            sender.sendMessage("Player command only");
            return false;
        }

        Player player = (Player)sender;
        // setlobby
        if( commandLabel.equalsIgnoreCase( "setlobby" ) )

            if(sender.hasPermission("event.setlobby") ) {

                if(args.length == 1) {

                String world = player.getLocation().getWorld().getName();
                double x = player.getLocation().getX();
                double y = player.getLocation().getY();
                double z = player.getLocation().getZ();

                this.getConfig().set("root.lobbies." + args[0] + "-lobby.world", world);
                this.getConfig().set("root.lobbies." + args[0] + "-lobby.x", x);
                this.getConfig().set("root.lobbies." + args[0] + "-lobby.y", y);
                this.getConfig().set("root.lobbies." + args[0] + "-lobby.z", z);

                this.saveConfig();

                player.sendMessage(ChatColor.GOLD + "Lobby "+ ChatColor.RED + args[0] + ChatColor.GOLD + " set!");
                }
                if(args.length == 0) {

                    player.sendMessage(ChatColor.RED + "Usage:" + ChatColor.GOLD + "/setlobby " + ChatColor.RED + " <Name>");
                }

            }else{
                player.sendMessage(ChatColor.RED + "You dont have permission");
            }
        // setarena
        if( commandLabel.equalsIgnoreCase( "setarena" ) )

            if(sender.hasPermission("event.setarena") ) {

                if(args.length == 1) {

                String world = player.getLocation().getWorld().getName();
                double x = player.getLocation().getX();
                double y = player.getLocation().getY();
                double z = player.getLocation().getZ();

                this.getConfig().set("root.arenor." + args[0] + ".world", world);
                this.getConfig().set("root.arenor." + args[0] + ".x", x);
                this.getConfig().set("root.arenor." + args[0] + ".y", y);
                this.getConfig().set("root.arenor." + args[0] + ".z", z);

                this.saveConfig();

                player.sendMessage(ChatColor.GOLD + "Arena "+ ChatColor.RED + args[0] + ChatColor.GOLD + " set!");
                }
                if(args.length == 0) {

                    player.sendMessage(ChatColor.RED + "Usage:" + ChatColor.GOLD + "/setarena " + ChatColor.RED + " <Name>");
                }

            }else{
                player.sendMessage(ChatColor.RED + "You dont have permission");
            }
        // arena
        ConfigurationSection section = this.getConfig().getConfigurationSection("root.arenor");
        String arena = args[0];

        if( commandLabel.equalsIgnoreCase( "arena" ) )

            if(args.length == 1) {

                if(section.contains(arena)) {

                String worldName = section.getString("world");
                World world = this.getServer().getWorld(worldName);

                double x = this.getConfig().getDouble("x");
                double y = this.getConfig().getDouble("y");
                double z = this.getConfig().getDouble("z");

                Location loc = new Location(world, x, y, z);

                player.teleport(loc);
                   player.sendMessage(ChatColor.GOLD + "Teleported to: " + ChatColor.RED + args[0]);
                }else{
                    player.sendMessage(ChatColor.RED + "That arena does not exist!");
                }
            }else{
                player.sendMessage(ChatColor.RED + "Usage:" + ChatColor.GOLD + "/arena " + ChatColor.RED + " <Name>");
            }
        return false;
    }

}