What do you type in it???? Well, it depends on what you want it to do

Scripts can to 1001 different things ... as you are new to mapping my recommendation is: don't bother with scripts just yet. They are for advanced mappers or mappers with some coding experience ...
I would suggest that you put together some interesting looking maps and post some screen shots here. Then if you have an idea for a quest to go with the maps, and if someone on the dev team likes your maps they might help you to write the necessary scripts.
Also, did you read all the posts in the scripting forum like I suggested?