How to connect my Hitachi TV to my Home surround

Sep 28, 2018
We recently moved into a new home with a surround sound speakers connected in the ceilings. The connectors on the walls are just RCA type, while my Hitachi, 55" Class 4K UHD HDR TV with Roku TV - R80 Series, only has 2 kinds of outputs; optical and 3.5mm (which I think is for headphones). How do I go about this? What do I need for my TV to work with my home surround sound speakers?