What accessories do you need for a Nikon D3100?

D3100 accessories

Along with the D3100 kit, you need to get a memory card, class 10 is best for video, as your absolute must to make the camera work. It is strongly recommended that you get a bag, UV lens filter to add an extra layer of protection to the lens, and cleaning supplies, like a microfibre cloth or lens paper.

A good book about the basic principles of photography. If you how photography works, you'll know what accessories to get.