When taking photos, controlling light in all its aspects is definitely not a walk in the park. As such, practicing with a single speedlight and a subject is the simplest way to begin.
In my case, I just got my Nikon SB-900 and controlled it wirelessly via my D90’s Creative Lighting System or CLS. The end result are these two photos of Goomba in my room.
Equipment used: Nikon D90 + Nikkor 50mm f1.8 AF-D + Nikon SB-900 Speedlight + Generic Close-up Filter