How to hook sonos sound bar to Samsung smart tv

I need help hooking my sonos sound bar to my Samsung smart tv. The sound bar only has an outlet for an eithernet cable and and optical wire, whereas the tv only has hdmi (eArc), other hdmi ports and an ethernet port. I could hook the sound bar up to the cable box but that seems to only allow the sound from the cable box to play (even when i turn the tv off btw). I would like to set it up so that any audio that comes through the tv will come out of the sound bar instead of the tv speakers. So, if i wanted to use the tv apps or play the Playstation, the audio would come out of the soundbar. Is there a way to do this without relying on a Bluetooth connection? Is there a specific hdmi to optical adapter i need? I am not completely tech challenged but im far from tech savvy lol. Please help, and if you could explain it to me like im a but slow, that may help 😅. Much appreciated.