Very new, building first game

Hi there, I'm building my first escape room with another person who has more knowledge than me but are not as available and I'm wanting to help with the scripting. I've generated all the assets but now would like to script the following: 12 objects that need to be put into a trigger area that either counts the objects or sends a message to each player how many objects have been found.

If someone could point me in the right direction to get started on this, that would be great.