First of all… welcome to CF !
Normally you would have a breaker on the dock
and also a specific shore power Main breaker on board with some kind of voltage meter and probably a ground fault indicator so you can monitor
what is available.
With both off, plug
in at both ends then turn on dock
Your on board meter should indicate 230V or 110V depending on your system and no ground fault indication.
Then you turn on the on board main breaker and then individual AC loads… (one at a time) …if they are on separate breakers, so as not to get an initial surge of everything coming on at once.
Removing is pretty much the reverse.
Get used to feeling the temperature of your shore cable and connectors as it is a simple way to tell if a connection is a bit loose and getting hot