Does anyone have any tips for buying/setting up a cheap surround sound system?

I am by no means a audio-tech but I know a few basics about amps and speakers. I’ve checked at some good-wills and what not but not found anything really worth buying. I picked up 2 speakers for cheap that need to be plugged in to a power amp that I do not yet own.

I do not care if the equipment is used and quality is not of major importance to me, just that it works correctly.

So if anyone has any tips for where I can get a used or new, but cheap, system that I can hook up to my tv let me know!

Any other tips or recommendations about setting up a surround sound system is greatly welcomed as well!