Don't go back on your word. When you've agreed on a contract price, don't renege; it will come back to haunt you later.
When working on your game plan, play to your quarterback's strengths. If he's a poor long-distance thrower, lower the percentage of long-distance passing plays.
Be especially careful when you choose a scout. A poor scout may show an excellent player as bad, and you might pass up some great talent; or worse, you'll pay a lot for a mediocre player who hurts your team more than he helps.