I'd say your best bet would be to download the kind of map you want to make, open it in the editor, and study the triggers, locations, and settings for a while. Then try to make your own map, and if you have any questions about what you're doing, it'll be easier for us to help you because you'll have specific problems rather than a generalized question.
If you're looking for a general idea on what steps to take in making your map, attach a map which is similar to the one you want to make, and I'll give you a quick run through on how you'd make it.