When you move, you can indicate direction or move to [name of adjacent location]. I will understand both.
At the start of the game, no players will be in the location of any other and also not in Lonely Mountain (other than a fire breathing vicious dragon)
You will learn when you share location with another player (unless (s))he is hidden) and you will have full chat with that player.
There are many items to be found in this game, so abuse your search action. Items might unlock new actions.