Beginner help please

Hi guys, I have what is probably a fairly simple question.

I have a sphere, I want players to have certain things put on them when they are inside the sphere (buffs, score multiplier, glowing effects on the characters). I’ve got to the stage where I have a translucent sphere you can walk through and finding it hard to find info on where to go next, hoping there’s a fairly easy way to do it. If not happy to spend the time looking into it just not really sure what I’m looking for.

If someone could just point me in the right direction it would be much appreciated.