According to the Nikon website, these items should be included with the camera body:
Supplied Accessories: EN-EL14 Rechargeable Li-ion Battery MH-24 Quick Charger DK-20 Rubber Eyecup UC-E17 USB Cable EG-CP16 Audio Video Cable AN-DC3 Strap DK-5 Eyepiece Cap BF-1B Body Cap BS-1 Accessory Shoe Cap NikonView NX2 CD ROM
The size of the memory card you choose will determine how many photos you can fit on it. But the number of photos will also depend on whether you shoot JPEG or RAW. 16GB, 32GB, 64GB are all good options. Smaller cards will work, too, but will just fit fewer photos and/or less video.