you are pretty much correct; from left to right are rotor brake, emergency fuel cut-off (the stubby one is attached to a stop-cock just upstream from the engine - very simple), and the fuel flow control lever (throttle) which is attached via cable to the FCU (mounted to the engine).
in a turbomeca powered machine (excluding the B3) the pilot controls the amount of fuel introduced at start up with the position of the yellow lever. starts are generally initiated by pressing the button on the top of the throttle lever and after Ng reaches 10% advancing the throttle lever until light-off occurs. T4 (temp) is modulated to 700C and the button must remain depressed until Ng reaches 40-45%. as the engine speeds up T4 will drop of course but throttle must be advanced to 70% Ng which is idle.
in cold weather, the throttle can be advanced as soon as the button is pressed.
in the B2/BA the generator can be selected "ON" while starting. can't do that in Bell intermediates, at least according to the flight manual (i'm sure someone has tried it but i don't know how well it would have gone!).
hope this helps
fp