How do you make a block be placed when purchased from a shop GUI?

I don't know how to make it so when you press the purchase button, you receive a block but in this case, a piece of land. What do I add to my script to make a block become placed?

local plr=game.Players.LocalPlayer
script.Parent.MouseButton1Click:connect(function()
if plr.leaderstats.Cash.Value>=100 then

end
	
	
end)