Quick answer
New player wants an easy first killer.
What makes a good first killer
A beginner-friendly killer should help you learn fundamentals: finding survivors, controlling loops, choosing when to leave chase, and protecting generators. Complex mobility or precision powers can wait.
Safe first picks
Wraith, Huntress, Trapper, and Hillbilly each teach different fundamentals. Wraith teaches patrol and first hits, Huntress teaches ranged pressure, Trapper teaches map planning, and Hillbilly teaches movement discipline.
Avoid chasing skill ceilings too early
Hard killers can be rewarding, but a new player usually gains more from consistent matches than from a power that only works after many hours of practice.
Is Nurse a good beginner killer?
Nurse is powerful but difficult. New killers usually learn the game faster on a simpler killer before learning Nurse-specific movement.