...what do I need to learn/do/buy?
I caved and bought a Ruger GP100 Wiley Clapp (3" bbl., .357), because I thought I should have a revolver in the house. This will be a "secondary" handgun, not my normal carry piece. The idea was to have a general purpose, "Jack of all trades" revolver; a "fun" gun, something I could put in the hands of my wife or older children in the case of an emergency, and a "50 state legal" gun in case my state went "full retard" (movie reference, not social commentary).
I already have plans to buy a holster, a couple speed loaders, ammo (both .38 and .357). What do I need to get started?