So I recently started DMing for the first time at a school club. I was basically voluntold by the teacher, and have never even played D&D as a player before. So I read 70% of the Player's Handbook and watched some videos, etc.
I get into the first session, and all the players are murder hobos right off the bat, and I don't want to punish my players too severely because they are new, what do I do??