Forum rules apply.
How to be a Game Master for someone
- Remember you're here to help the player figure out things about their character. You're roleplaying the environment and any NPC you deem necessary so that the PC can interact with them.
- Be sure to communicate with the player, don't leave things unresolved.
- Know you don't need to do anything you'd be uncomfortable with. Neither does the player.
- You can create a character called "Game Master" or something similar for this role, or make your posts with your player account - either is fine.
It's a chance to try playing various types of people (NPCs) and get really good at describing things.