Bah. You guys need to learn how to do stuff on your own. I'd recommend making really, really simple maps first. I think my first maps where all super blade master killing hundreds of unarmed villagers.
You need to get down the basics of where everything is in the editor before you can start learning about terraining, object editing---and I'd learn about all of that before even looking at the trigger editor---the trigger editor is gigantic and complicated. It is prodigous.
My advice? Keep your nose out of it, and open up any unlocked maps you find on battle.net to find out how stuff works---or warchasers or monolith. Those were basically designed by Blizzard to show noobs how to get used to the editor.