I've been trying to turn my friends on to table top rpg's for years. I think for someone completely new to any table rpg, it is better to have them play pre gen so the mechanics are easier to grasp. that way they can indulge in the role playing, and the strategy of the game. for someone who's new to pfs, but knows what initiative is, making your own character is essential to hit the ground running. i'm pretty new to pfs myself, and making my own character has really helped me understand the subtle differences.