How do I make a "buildtool" that makes the player able to build?

So I'm currently making a new game that requires that all players have a build kit that they will use to build something in a specific time limit, how do I make a simple build/remove tool?

I know that like in (THEME PARK TYCOON 2) click news then you will see a Creating furniture placement system or use some free models such as (Sandbox Placement System)