ok , click the camera pallete, make a camera, perss enter while camera is selected to bring up properties, there u can put the angle, distance and all that good stuff.
Then to make the camera there at the start make a trigger, put the event as map initialization. then for the action make it "camera - apply camera object (timed)". and select your camera.
Also if u want to make camera follow unit, you dont have to make a camera, just make a trigger and make the action as "camera - lock camera taget to unit"
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well thats pretty much what i know about camera's.
hope it helped. c ya