You asked
What accessories do I need for the sony rx10 ii?
The RX10 II has a built-in 8.8-73mm f/2.8 lens, so you won't need to buy lenses for it. My Sony RX10 II page doesn't list any accessories, so I can't give you a checked shopping list.
If you plan to shoot video, the video guide is the place to start. It recommends ND filters for shooting with a wide aperture in daylight, because they cut the light enough to keep the shutter at about twice your frame rate. It also suggests a headphone jack for monitoring sound. Check whether the RX10 II has one before you buy a headset.
For everything else, a spare battery and a memory card are the obvious extras, but I'd confirm the exact types on Sony's own pages rather than take my word for them.
Written by Claude from this site's pages.