Where I failed?

What's wrong here?:

Code (Text):

package project.gui.test;


import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.enchantments.Enchantment;
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.inventory.InventoryClickEvent;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.plugin.Plugin;
import org.bukkit.plugin.java.JavaPlugin;

public class GUI extends JavaPlugin implements Listener {

    public void onEnable() {
        getServer().getPluginManager().registerEvents(this, this);
     
        public boolean onCommand(CommandSender sender, Command cmd, String label, String args[]) {
         Player player = (Player) sender;
         if(commandLabel.equalsignoreCase("SetStart")){
             if(args.length == 0){
                 player.sendMessage(ChatColor.RED + "/setStart ");
             } else {
                 Location location = player.getLocation();
                 if (!(StartCounter > 1)){
                     StartLocation[StartCounter] = location;
                     StartNames[StartCounter] args[0];
                     StartCounter++;
                     player.sendMessage(ChatColor.GREEN + "Start Set As: " + args [0]);
                 }else{
                     player.sendMessage (ChatColor.RED + "There Are Enough Starts, no more needed!");
                 }
               }
     }else if(commandName.equalIgnoreCase("TeleStart")) {
         for (int i = 0; i < warpNames.lenght; i++) {
             String warpName = warpName[i];
             if  (args [0].equalsIgnoreCase(StartName)) {
                 Location warpLocation = warpLocation[i];
                 player.teleport(StartLocation);
                 player.sendMessage(ChatColor.DARK_GREEN + "teleported To " + StartName);
                 break;
             }
         }
     }else if (commandLabel.equalignoreCase("SeeStarts"))
         String Starts = "";
         for (int i = 0; i < StartNames.lenght; i++){
             if (i != warpNames.lenght){
                 warps += warpNames[i] + ",".reaplace("null","");
             }else{
                 player.sendMessage(ChatColor.DARK_GRAY + "Showing The Starts:" + ChatColor.GRAY + starts);
             }
         }
         }
    }
}
       
   
 

THANKS Please, don't be rude, I know I'm noob

 

ERRORS
1st

Code (Text):

7 Syntax errors+ illegal modifier + invalid args: public boolean onCommand(CommandSender sender, Command cmd, String label, String args[]) {

2nd

Code (Text):

 Syntax error (AssignmentOperator expected) StartNames[StartCounter] args[0];

3rd

Code (Text):

Syntax error (Identifier or new, insert ';' , "AssignmentOperator Expression" to complete Assignment):
String Starts = "";

 

Thanks