All I've seen agents do is talk players into having bad senior seasons because they're trying to keep themselves from getting injured.
Coaching is nothing more than eliminating mistakes before you get fired.
The answer is surprisingly simple. Just do right. Live an honorable life.
Don't run if you can walk. Don't walk if you can stand. Don't stand if you can sit. Don't sit if you can lie down.
Give me a blackboard. I can stop anything on a blackboard.
I don't play well enough to be allowed to throw my clubs.