First, make sure your TV actually has a composite (video signal) input, a yellow one, or a SCART connector. anything else is unusable, so no "antenna input", or non compost video inputs.
Then using a reasonable quality RCA to RCA cable (RCA is also known as "tulip plug) connect the yellow RCA output of the PI to the composite input (either SCART or yellow RCA connector) of your TV. If your TV doesn't have a SCART or yellow video plug it not useable!
For sound, you connect the 3.5mm mono jack plug cable to either a set of amplified speaker boxes, or with a split cable (to two, red, and white RCA plugs) to the red and white audio inputs of your TC, or via the SCART input, using a Triple (yellow red white) RCA to SCART plug.
what you did read as if you tried to input the video signal into an audio input!