Text instructions don’t perform well in virtual reality for a number of reasons. Small text is hard to read. Users are often overloaded with visual information from the virtual environment around them. Consider including short audio summaries instead to provide users with instructions.
If you don’t have the resources for voice acting, consider using text-to-speech to introduce users to the application. Don’t rely on audio alone to convey instructional information (in case the user can’t access it), but augment existing visual instructions with short, welcoming audio prompts.
Similar to textual instructions, brevity is important.
Audio as background
Virtual reality applications are meant to be immersive. Users regularly wear headphones. Consider using environmental audio to make the application more realistic, and to draw the user’s attention to various areas of the app. Audio provides a way of communicating the entire scene to the user simultaneously, without requiring the user to move their head to look around to discover their surroundings.