Scripts

Hey guys! Help a newbie out. I've been searching the internet, but I can't find anything useful. Basically, I need a simple script (or trigger, whatever they're called) so that when the main hero enters a specific area, a hero (hidden in the fog of war, of course) teleports to him, and a window appears with a message. After reading the message, the hero returns to his original location. Whew. I hope you can help. I've read a lot on this forum (but not everything, it's 140 pages!), but I still don't understand. Also, it would be great if you could tell me where to put these triggers and scripts. Thanks in advance.