None of the frames will turn invisible, im pretty sure my script looks fine, why?

I will try to explain what is going on here, but I will admit you were approaching it all wrong.

-- Okay well your script for one is trying to modify StarterGui to change the players Gui. This won't work as StarterGui is just a storage for the stuff that gets replicated to a player on spawn.
-- In order to edit a players actualy GUI you have to edit his PlayerGui located in the player. Ie, local ScreenGui = game.Players.LocalPlayer.PlayerGui.ScreenGui
-- Secondly, What are you trying to define with playergui? What is workspace.Player? That isn't an actual thing unless you made it yourself. A player is made up of two categories, their player which handles all the scripts, and usually leaderstats and such, and then the players physical character which is stored in workspace and contains the limbs and humanoid of a player. You wont find anything related to GUI's here.
-- Thirdly, your script can be made simpler and I will show you how


--When creating Gui's you are supposed to place them inside of a ScreenGui. Lets go ahead and define that screengui
local player = game.Players.LocalPlayer
local ScreenGui = player.PlayerGui.ScreenGui

local function CloseGui()
	ScreenGui.Baguette.Visible = false
	ScreenGui.MainFrame.Visible = false
	ScreenGui.Frame.Visible = false
	ScreenGui.ScrollingFrame.Visible = false
	ScreenGui.SideInfo = false
end
local function rightClick()   
	print("Right mouse click")
end

script.Parent.MouseButton1Click:Connect(CloseGui)
script.Parent.MouseButton2Click:Connect(rightClick)




-- Now lets point out a few issues with your code so you can try to avoid them next time
local player = game.Players.LocalPlayer
local StarterGui = game.workspace.Player.PlayerGui -- This doesn't exist, unless you made it yourself. To get a players physical character model, you can get that with player.Character. Gui's are also not stored here, they are inside player.PlayerGui
function leftClick()
	--game.Workspace.Classes.Baguette.Parent = game.StarterPlayer     
	--game.Baguette.Name = "StarterCharacter" 
	game.StarterGui.Baguette.Visible = false -- You are modifying what is given to a player on spawn, instead of what they have already.
	game.StarterGui.MainFrame.Visible = false
	game.StarterGui.Frame.Visible = false
	game.ScrollingFrame.Visible = false -- game.ScrollingFrame doesn't exist, I assume you meant game.StarterGui.ScrollingFrame, but again wrong guis to edit.
	game.StarterGui.SideInfo = false
end
function rightClick()   
	print("Right mouse click")
end
script.Parent.MouseButton1Click:Connect(leftClick)
script.Parent.MouseButton2Click:Connect(rightClick)