I need help with a script! Can anyone help?

Your condition on line 01 affects the statement:

player.PlayerGui.Ermg.Left.MouseEnter:connect( somefunvalue )

Notice that this is the connection, and not actually the event firing. This only happens once.

It is the execution of somefunvalue which happens repeatedly, and which needs to check:

player.PlayerGui.Ermg.Left.MouseEnter:connect(function()
	if script.Heli6Ready.Value == true then
		if script.LookingLeft.Value == false then
			script.LookingLeft.Value = true
			camera.CameraSubject = target
			camera.CoordinateFrame = CFrame.new(target.Position)
				* CFrame.Angles(0, math.rad(181), 0)
			wait(0.01)
			camera.CameraSubject = target
			camera.CoordinateFrame = CFrame.new(target.Position)
				* CFrame.Angles(0, math.rad(182), 0)
			wait(0.01)
			camera.CameraSubject = target
			camera.CoordinateFrame = CFrame.new(target.Position)
				* CFrame.Angles(0, math.rad(183), 0)
		end
	end
end)

I cannot guess from what you have provided where these two lines belong:

script.Heli6Ready.Value = false
script.Heli4Ready.Value = true

Style suggestion:

You don't need to check if a value is == true.

if script.Heli6Ready.Value then

Is shorter and usually clearer.

Similarly, instead of using == false, use

if not script.LookingLeft.Value then