A tripod ensures a steady, un-jumpy shot and a nice, level picture. If you are shooting from the bleachers with a tripod position two of the three legs on the lower step and the other - shortened by 10 inches or so to level things up - on the upper step.
The beauty of sports is that they are unpredictable. Record the whole game while your subject is on the field so you don't miss anything. In most cases, you will want to record several games to give you the widest possible selection of plays.
Additional shots always make your video more interesting. A short interview with the player before or after the game, establishment shots of the stadium, the scoreboard, the crowd, the mascots, the cheerleaders – these all contribute to the whole story and make your Sports Highlight video more fun.
At the first game break, check your footage to see what it looks like and that you have audio. Make any necessary adjustments. Remember, the teams won't replay the game because you didn't get what you wanted!