1
He is on a quest for the truth.
To sign this, point to the person, then perform the sign for 'quest' by sweeping your 'C' handshape across your chin and closing it into a fist. Finally, sign 'truth' by moving your index finger forward from your lips. Keep your facial expression focused and determined.
2
The hero's quest was long and difficult.
Start by signing 'hero', then use the sweeping 'C' to 'S' motion across your lower face for 'quest'. Finish the sentence by signing 'long' and 'difficult'. Make sure to emphasize the effort involved by using a strained or intense facial expression during the sign for 'difficult'.
3
I started a new quest in the game.
Begin by signing 'game' and 'new'. Then, perform the 'quest' sign by starting with a 'C' handshape on the dominant side of your chin and closing it into a fist as you sweep across. This is a great way to describe objectives in video games or role-playing adventures.