How can I make this into a simple click dectector?

The code block below will be the script for this and if you want an explanation, it will be below the code block.

-- make a part with a click detector and a script as its child.

local debounce = false

script.Parent.MouseButton1Click:Connect(function(player)
    if not debounce then
        debounce = true
        local Explosion = Instance.new("Explosion")
        Explosion.Parent = workspace
        Explosion.Position = player.Character.HumanoidRootPart.Position
        script.Boom:Play() -- also add the sound as a child of the script.
        wait(3)
        debounce = false
    end 
end)

The listeners of MouseClick get the player who clicked the part as an argument, similar to how Touched event listeners get the part that touched.

If you have any questions feel free to leave a comment and I'll answer it ASAP