No need to apologise for your ignorance! We are all forever learning

My knowledge on turboprops is not great, but I know the procedures are not well simulated in flight sim.
This video might be useful, its not completely clear, but it seems to me that there is not a need to keep the switch held down.
If the process is anything like larger turbofan aircraft, which I think it probably is, then there is no need to hold the ignition switch down, and it will automatically cut-out and switch off once the turbine is driving itself.
Hope this helps.