new Menu:teleportmenu;
teleportmenu = CreateMenu("Teleportmenu", 2, 200.0, 100.0, 150.0, 150.0);
	AddMenuItem(teleportmenu, 0, "Cars");
	AddMenuItem(teleportmenu, 0, "Boats");
new Menu:CurrentMenu = GetPlayerMenu(playerid);
if (CurrentMenu == teleportmenu)
{
	switch(row)
	{
	  case 0: //Cars
	  {
	  	SetPlayerPos(playerid, 2008.595, -2382.287, 13.3382);
	  	SetPlayerInterior(playerid, 0);
	  	SendClientMessage(playerid, 0xFFFFFFFF, "Welcome to the Car Lot");
		}
		case 1: //Boats
		{
		  SetPlayerPos(playerid, 467.115, -2534.099, 13.3382);
		  SetPlayerInterior(playerid, 0);
		  SendClientMessage(playerid, 0xFFFFFFFF, "Welcome to the Boat lot"
		}
	}
}
if(strcmp(cmdtext, "/teleport", true) == 0)
{
	ShowMenuForPlayer(teleportmenu,playerid);
	return 1;
}

new Menu:teleportmenu; // This creates a Menu with name of :teleportmenu

public OnGameModeInit();
{ // Start bracket.
teleportmenu = CreateMenu("Teleportmenu", 2, 200.0, 100.0, 150.0, 150.0); // teleportmenu = << here we put in the name of menu which we created above and do CreateMenu(functions....)
AddMenuItem(teleportmenu, 0, "Cars"); // This adds a ITEM to the specific menu, ex: AddMenuItem(MenuName, column,String.);
AddMenuItem(teleportmenu, 0, "Boats"); //same as above
return 1; // Return a 1, mostly every command returns a 1.(i don't know how to explain this to you but i know when to put in a 0 or something myself (lol))
} // Ending bracket, we put } which is ending bracket because there is a start bracket which i marked above
public OnPlayerSelectedMenuRow(playerid, row)
{ // Startbracket
new Menu:CurrentMenu = GetPlayerMenu(playerid);
if (CurrentMenu == teleportmenu)
{// 2nd bracket
    switch(row)
    {//3rd bracket
      case 0: //Cars //A menu Always begins with case 0: and has a opening bracket. which is in this case below case 0,the //4th bracket
      {//4th bracket
        SetPlayerPos(playerid, >>> HERE ]2008.595, -2382.287, 13.3382 << HERE); //Set's the player position to the specific X,Y,Z Float coordinates.
        SetPlayerInterior(playerid, 0); // Set's player interior, in this case its 0, SetPlayerInterior(playerid,0);
        SendClientMessage(playerid, 0xFFFFFFFF, "[MESSAGE IS HERE >> Welcome to the Car Lot"); // Send the client message;
        }//4th bracket closes(if u didn't get if the code is intended you should see that brackets are equal, ex:
  { // Opening bracket
  | // Just to show that they're line is equal so you can see which opened bracket closes somewhere by following it.
  |
  |
  |
  } // Closing bracket

        case 1: //Boats
        {
          SetPlayerPos(playerid, 467.115, -2534.099, 13.3382);
          SetPlayerInterior(playerid, 0);
          SendClientMessage(playerid, 0xFFFFFFFF, "Welcome to the Boat lot"
        }
    }
}
public OnPlayerCommandText(playerid, cmdtext[])
{
if(strcmp(cmdtext, "/teleport", true) == 0) // this creates a command
{ // again starting bracket
|   ShowMenuForPlayer([b]teleportmenu[/b],playerid); //show's the specific menu for player( MENU WHICH TO SHOW IS BOLD)
|   return 1;
}// endingbracket of command
return 0; //Cmdtext end with a return 0 if it is a unknown command, you can change it i guess to: Return SendClientMessage(playerid,COLOR,string); which shows a msg if it's unknown command in your style.
} // ending bracket of opened commandtext