How do I do store scripting with dialogue?

Okay so, I need to know the EXACT script on how to do a dialogue store where all the stuffs is free! (For example, "Paint brush for 0 coins!" And when you click on that it gives you a paint brush.

script.Parent.DialogChoiceSelected:connect(function(plr, dialog)
	toollocationhere:clone().Parent=plr.Backpack
end)

Instead of scripting that, you can automatically have it in your inventory when you join the game.

script.Parent.DialogChoiceSelected:connect(function(plr, dialog) toollocationhere:clone().Parent=plr.Backpack end)