Step 3: Keyboard and Mouse
This keyboard is really nice for a few reasons. One is the size. It's small enough to carry around in your pocket. It also has a backlight, and is rechargeable. Did I mention the battery is replaceable? That's not something you see in portable electronics these days.
Anyway, make sure you plug the receiver into your Pi, and charge the keyboard for a few hours before using it for the first time.