Inneed of eletrical help for caravan

[Barni]

Hi,
I have just bought a Sprite Alpine 1994 2 berth.
I have little to no caravan experience so I apologise if these questions are incredibly stupid.
I connected the caravan up to the mains at home but I'm not sure which setting the rocker switch should be on (car, caravan or off), whether the battery should be left connected or be disconnected ( I dont think it has a battery charger), how I check that all the eletrics run off the mains correctly.
Any help would be much appreciated
Many thanks