How do I make a clicker style game?

I'm trying to make a clicker style game similar to Doge coin clicker, and I don't how to make it. Can anyone explain how?

You want the game to be 2D like Doge coin clicker? Could be done using UI objects such as a UI button. If the button is clicked, then the player gets a score. Or did you want it to be 3D like the Cookie Miner game in Core?

Make 3D, with 3D shops to go along with it