Hey dude, thanks very much.
To load the maps you need a person to play with you.
Play the first map with your friend, then it gives you a code.
Then go to the second map with your friend, and enter your code, and carry on like that.
I can't do a joint map with you I'm afraid because I already have a lot of work to do as you can see, (the night elf campaign), sorry!
Maybe you could make a post in here to get some help!