Resetting an old iPod and iPod shuffle to factory settings

I was just given a couple of older iPods from a friend of a friend who no longer wants them.

As I am “old school” I thought I would use one in our car on long trips loaded with music my husband and I want to listen to.

I am in the process of charging them……to see if they even work. I have checked one of them, and there are many songs loaded to it, but not our style of music.

So my question, is how do I restore the iPod to factory settings and then download our music from our iTunes Library? Do I have to do it via iTunes? I want to make sure that iTunes doesn’t “sync” the music on this iPod, ie downloaded it onto my library as I am not interested in it at all. Any Suggestions? Of course, I do not have a password for this used iPod.