Find my Mac
Hi,
I see you are not sure about Find My Mac, now how useful it will be depends on which model you do have.
If you have one of the later models with the T-chips AFAIK you should be able to render it useless by putting it into Lost Mode, also DO NOT remove it from your account, by doing that you simplify the thief's job, he just needs to erase it.
If you have an older model you are out of luck as once erased it would be usable.
Another tip, and that's how I found mine after it was stolen ... Check the pawn stores, that's where they often get dumped.
Good luck,
Cheers
P.S.: Call Apple Support I am no expert.