For engine start I have beacon on. Also I use the RWY turnoff light on the side of engine being started.
For taxi I use taxi and nav lights. I my nose points to somebody I'll turn the taxilight off.
T/O all lights on ... you can never have enough lights on to show people where you are.
One exception ...Strobes. Strobes stay off until cleared for T/O if there are other aircraft holding short.
Some airlines have the tendency to complete the whole checklist before lining up and sit at the end of runway with strobes flashing in my face for sveral minutes.
JJ