map edit questions multiplayer zero hour

I have a few questions:

First- where can I find the original maps like twilight flame in the folder for zero hour. I would like to open them with the worldbuilder program and customize them for multiplayer?

Second, when I edit some maps I downloaded from the EA website like Iron Dragon and make a change to it- it is in the folder, but does not appear in the user maps when I play the game. I made sure the folder name and files names match.

Or I just open it then save it. But is does not show up in the user maps and I can not play it?

and third does anyone have come cool maps or multiplayer missions to share?

I have been picking up some cool team based multiplayer missions that people have created and play them online.

I think that the online multiplayer is much more fun than just playing the pc. Where can I get more of this kind of stuff?