You will need an amplifier with between 10-20 watts per channel.
If the TV has a headphone jack you can connect the amp there. The TV remote would control volume in this case.
If the TV has fixed analog audio output you would need an amp with it's own remote for volume.
If the TV has digital audio output then you would need an DAC or an amp with a built in DAC. It would need to have remote volume since this is also a fixed output on the TV.