The screen has its own brightness and preview settings which you can change in the setup menu. By default the screen settings make sure that you see something on the screen in all environments including dark rooms. To make sure you‘re getting the correct exposure independently from the screen preview watch the exposure meter on the screen.
Welcome, William! There should be a label on the charger specifying if it‘s multi voltage. If it is, you still need a plug adapter. There are a lot of different sockets in Europe.