Here’s how we did it: https://www.frugalfamilytimes.com/2018/10/how-to-get-rid-of-mice-rodent-proofing.html?m=1
Here are some great tips: https://www.terminix.com/blog/diy/the-eight-best-ways-to-get-rid-of-mice/
Tom Kat rat poison. No home remedies ever worked for us.
Put traps or bait down straight away. I know many people find it inhuman. But the damage a little mouse can cause is huge. I had one the ate a hole in the side of my couch and chewed the electric wiring.
Seal up all entrances in your home for them to get in. I once nailed can lids (folded to fit against the floor and baseboard) to the baseboards where the holes were. I did prevent them from getting in but could hear them at night running around in the ceiling. It was a very old small house we rented for a short time. Ewww... I know.