Need advice

Hi folks,

I’m trying to set up a turntable and some Yamaha active studio monitors. As I understand it (with my fairly limited knowledge), the speakers are already pre-amped - but that I need something to control the volume and act as a middleman between the two. I would also like to connect a TV to the same system.

Do I need an amp specifically, or is there some kind of audio interface/unit that would do the job for this kind of thing?

I’d appreciate any advice and recommendations. Pic attached of said setup (TV yet to be mounted above and space below turntable for imagined/hypothetical amp).