Start every game with a definate plan. Know what your tactics are and how your going to achieve them and then stick to them no matter what! The only way you'll know if a game plan is good or not is if you stick it out till the end!
Start by break the game down in chunks of achievable targets. e.g....
0-20 Minutes: Concentrate on defense, and kick any ball for territory. Only strike on a sure thing (Pressure Play Cards)