The stereo speakers and T-amp is a small stereo Hi-Fi system. The amp has connections for speaker wire. The speaker have connections for speaker wire. It's no surprise then that you need to buy some speaker wire to make the hook-ups.
Red goes to red, black to black. That side of it is child's play.
What's slightly more complicated is getting a signal from the TV then controlling the volume. If the TV has a headphone jack then one of these cables will do just fine. Play around with the TV remote and see if it will alter the volume through some headphones. If yes then it's do the same through the cable to the amp.
If there's no headphone jack socket on the TV then you'll need to get the Optical signal and run it through a converter to give stereo phono (red/black or red/white plugs). While the optical converters aren't massively expensive (under £10 from the auction site or rain forest) it does need power. That'll be either from a USB socket on the TV, or from a wallwart power supply - so you buy the version of the converter that comes with a 3 pin prong UK plug. You may need to buy an optical cable, and you'll definitely need a stereo phono cable. Individually none of these are expensive items, but the cost does start to mount up.
The Achilles Heel of the T-amp though tends to be volume control. If you have to go the optical route now or in the future then the T-amp is going to leave you stuck high and dry because the vast majority don't have any form of remote control at all. Getting up every time you need to change the volume will get old real soon. There are some T-amps with IR remote, but IMO they look like they came from the 1970's CB radio store, and the remotes they use are those little credit card style jobs. They're okay from a metre or two, but they don't have enough power to get a signal across a living room or cope with bright sunlight interfering with the IR signal.
Stereo speakers should give more bass than the sound bar. Whether a T-amp has enough balls to make them go loud is another matter.
If you still like the idea of stereo speakers, but you want the convenience of remote control, have a look at the
Edifer Studio R1280T @ £89. They're stereo speakers with amplification built in. You'll still need a jack to stereo phono cable, or an optical converter + cables, but at least you have a decent remote control to that side of it is covered. Oh, and as a loyal Overclockers forum member I think you get free shipping too. That can't be bad