How to play Dungeons & Dragons: Adventure Begins

About Dungeons & Dragons: Adventure Begins, from BoardGameGeek:

The Dungeons & Dragons: Adventure Begins co-operative board game is a fast entry into the world of D&D. In the game, players choose their characters, then journey through the lands of Neverwinter, working together to overcome fantastic obstacles, battle monsters, and defeat the Boss monster terrorizing the realm. The role of Dungeon Master passes from player to player with each turn, so everyone gets to be part of the storytelling. -description from the publisher