And what not to do:
Trade for or sign on FA contracts and therefore put too much faith into extremely mediocre late/mid career bullpen arms like Cimber, Bass, Swanson, Richards, Garcia, and Pop. That's how you end up with a disappointing pen while feeling like you can't really do anything with it. Because most of the guys don't have options or project "fine" or you traded for them recently and they "have good stuff" so you feel beholden to the asset.