Load your video into the editing system. If it's non-linear like Edius, you may need to ingest it in real time. Create and save the project. If it's tape-to-tape, you're all set to go.
Scroll through b-roll to remind yourself of what shots were gathered. If someone else shot it, this is your chance to familiarize yourself with the content.
Tell the producer if there's something you shot or didn't shoot that could affect the script. For example, if you got there late and missed the induction, make sure they know that.
Get a voice-over (VO) script from the reporter or producer. Look it over, to make sure you have video to match most of what is said.
Cut the video. If you're working on non-linear, drag some clips from your bin and drop them on the timeliness. If you're working tape-to-tape, set your in-point on the recording deck.
Start with an establishing shot. This is a wide shot of the event, accident or the like. It helps give the viewers a broad idea of what the story is about. Trim it to be about five seconds long. If you're editing tape to tape, set your in and out points on the play deck and hit "Take."
Lay down the rest of the video, to correlate with the script. For non-linear editing, bud up each piece of video after the other, adding dissolves if desired. With tape-to-tape, keep setting new in and out points to lay down the video.
Make the voice-over 40 seconds long. That's the standard. If the script looks longer, though, add more so video so it doesn't go to black.