How to make a GUI script that makes like a narrator talk?

Now I know how to make a text box but I am not neccesarily familiar with gui scripts so I was wondering if anybody knows how to make a narrator Gui script or a link that teaches me.

Do you mean this?

local function effect(object, text, timebetweenText)
	for i = 1,  #text, 1 do
		object.Text = string.sub(text, 1, i)
		wait(timebetweenText)
	end
end

--effect(gui, "Everything you want", time between each word)
--ex
effect(script.Parent, "Hello!", 0.5