Unless he gets a tome, the only way to get get Mystic Regeneration is from the trainer in the Mouth of Torment.
First and foremost, having the highest level armor is best for survivability. You can get a ferry to the docks, but if you're a new player to Nightfall and want to experience the game without any jumps, you can get new armor in Jokanur Diggings and Blacktide Den, depending on how far along you are with the Istani storyline.
Second, I would recommend that for your fourth party member you bring the Monk henchmen. Having two monks (Dunkoro and the henchmen) in tandem will be a significant boost to your party. At this point, having a random damage dealer as your fourth is probably what's holding your party back the most, since one monk is trying to heal three other guys that are in the thick of the battle.
And whatever build you can throw together at this point should be sufficient. It's not really necessary that you should have to start coming up with a good build until later on when you have more experience with the class.
