What extra duties might the referee give me near the try line?

Your normal duties (touch, touch-in-goal, kicks at goal) apply in in-goal too. World Rugby's assistant referee guidance says the referee may also ask you to:

• advise whether the ball was grounded or held up
• indicate touch-in-goal or dead ball
• advise on the restart: 22 drop-out, goal-line drop-out or 5 m scrum

Use leading and trailing so you and the referee see the play from different angles. In open play the referee is usually in line with the ball as it nears the goal line, so get into in-goal for another view; if a maul goes over and the referee is already in in-goal, take a different angle. The referee should look to you for visual confirmation before awarding a try, and may stop play to talk to you first.