How Would i make a mining place, just talking about the tool and blocks?

For the tool do you put in a local script inside of the tool and how do i make the blocks multiply when mined?

This isn't a do it for you place, we help. Look on the ROBLOX wiki first.

Well, why don't you actually try, and we'll help you. The title of this website is "Scripting Helpers", not "We make free scripts for you" for a reason.