You asked

What accessories do I need for the sony rx1r?

The site doesn't cover accessories for the Sony RX1R, so I can't give you a list of recommended extras. The Sony RX1R page has its specs: a built-in 35mm f/2 lens, no stabilisation, and a 24.3-megapixel full-frame sensor.

Since the lens is fixed, you won't be adding lenses. Because there's no stabilisation, a steady support may matter when light is low. If you plan to shoot video with a wide aperture in daylight, the Video guide explains why ND filters help. For choosing a camera around your subjects, the home page is the place to start.

Written by Claude from this site's pages.

From these pages