How to make an In Game tutorial?

I am making a Tutorial to introduce VR mechanics. I am assigned to make a Level that a Player can interact but he/she is set to do a list of very specific tasks. For instance, I would like to know how would I wait until the Player looks at a certain direction and then give a feedback to the player the when the task is complete. Mind you, just some starting point would be terrific. I just need an idea of how to get started on the problem.

Probably have a continuous line trace from the player camera out into your world and when the player is looking in the correct direction have a widget appear with instructions or something to do after. You can get this functionality by having a hidden object a large cube or something (depending on set-up this could even be something actually in your world for other purposes) and when the line trace hits that object you will know the player is facing the correct direction.