How to check if 2 players are touching their own part

How do I make a script that checks if there are 2 players touching their own part then does something? If you think of like any combat game such as hood fighting, where there are pads that the players stand on and that teleports them, and I was wondering how I would even go about checking if 2 players were standing on their own pads.

The first person to touch the first pad should lock onto them until they move out of the pad.
The first person to touch the second pad should lock onto them until they move out of the pad.

If pad one has a person and pad two has a person then, wait a couple seconds and teleport them to the arena and initilize the fight.

Yeah, I was thinking along those lines but Im not sure how I would be able to code that