(Sorry for huge request) how to enable pvp upon touching a brick?

so im making an rpg (for fun and such0dont have any lua experience....im slowly learning some things as i go....mainly using free scripts on the models market and such :/.,...ik i shouldnt be making a game without knowing how but im bored and want to :/....so i could use a script i found which lets you activate and deactivate a forcefield...then they could enable pvp anywhere but im wanting to have a sort of area for pvp only and i cant use it because the force field would disable the monsters from hitting players too....so what im needing is how can i make it where when a player touches a brick it allowes them to damage others players and when they touch it again it disables it. ik its a big request and i understand if it cant be done :/ im just trying to make a dream come true hehe