you can put the sky whenever you want ^^
just make some brushes with the "Sky" texture and u have the sky ^^
the simplest way to get a sky is to put a hollowed block around the level ^^
http://www.valve-erc.com/resources/
go here and looks for the tutorial called "using skys"
isnt showing you how to set up a sky but if im right it'll have a sky in there you can copy. And hey it will show you how to use the light environment.
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