You need XLR cables to connect the mics to the mixer. You have decide how long. I think 10 or 15 ft should be fine. https://www.amazon.com/Cable-Matters-2-Pack-Microphone-Feet/dp/B00KO8VY4O?th=1

You need cable(s) from the mixer to the speaker(s) Something like this. https://www.amazon.com/Monoprice-Premier-4inch-16AWG-Plated/dp/B001UJEKZ6

Even if you only have one speaker I'd buy two cables and plug the L and R Main Out on the mixer to Input 1 and 2 on the speaker

finally if you're going to run the Karafun audio output of the TV to the speaker you'll need a way to connect the audio out of your TV to the (Line 5/6) on the mixer.

I have a laptop, audio interface, microphone, guitar, and keyboard. And a little table. The mic, guitar, and keyboard will all plug into the audio interface. And so the audio interface will just output all the sound into these main out jacks.

You'll want something that switches to Male XLR. Either a DI or 1/4" to XLR

Ah ty! So two of these? https://www.amazon.com/Monoprice-Premier-4inch-16AWG-Plated/dp/B001UJEKZ6/ref=sr_1_5?crid=2IL62B70AM4BD&keywords=1%2F4%2Bto%2Bxlr&qid=1671647620&sprefix=1%2F4%2Bto%2Bxlr%2Caps%2C121&sr=8-5&th=1

Can you recommend how long a cable should I get?