A simple thing to watch for is style of play. Some teams play a real slow-down style, a lot of set plays, a lot of passing around the outside trying to keep things in front of them. Others play fast in transition and sort of freelance, quick passes to keep the other team off guard. When you get the two against each other, usually low-scoring team vs. high-scoring, it makes it interesting.
Watch the faceoffs... See if there's a dominant player on one team, usually a specialist. If they're winning a majority of the faceoffs and getting the offense started, that could be the story.
If you're covering college, there are plenty of stats recorded to give a good indication of how the game went (ground balls, clears, shots, etc.), and you can beef up the story with those, especially if coach brings something up after the game. Not sure how many stats are kept with high school games. Most coaches, from what I've noticed, really pay attention to lax stats because they give a pretty good indication of how each phase of the team is doing.
Not sure if that helps a little. I recently picked up a lax beat and covered a little in college, so I'm still learning a bit here and there.