There may be no connection on the TV for externel speakers (read the manual that came with the TV and see if there is).
It may be your sky box or freeview box (if you have one) has an "audio out". Again read the manual and see if the is.
Some people play their TV sound through the hi fi system.
Some people buy a "home cinema" system that is a DVD player and speakers combined. You can play the TV sound through that.
The other option is an Audio Video (AV) amplifier and speakers, but that may be too much for what you want.
If you want speakers that have no wires then that is likely to be more expensive than ones with wires, but you still need something to "drive" them.