There is an ability to filter out the different types of airbases. It comes under the “Filters” section. You might have to press “Space” for PC, I think, I’m on Xbox so it’s X or Y button.
As far as being able to start cold and dark at a seabase, there might be some free options available on flightsim.to but there aren’t any that I’m aware of that are in the default game. The default ones only have the option to start off on the “Runway” with the aircraft ready to go.