Will my games work on a mac?

You can only get games that say you can play them on the Mac. Look at the game's requirements.

Im pretty sure you can see that on the games specifications, some games work on mac, and other games have a different mac version

If it says theres a mac version, you can play it.
However, if it doesnt, you can always install Bootcamp and windows and play it there. (Macs can run windows)