Max HP at 1st level.
Level 2+:
Hit Points – At each level gained, Roll, except minimum additional hit points are the average of the die, rounded up. E.g., d4/3, d6/4, d8/5, d10/6, d12/7.
As DM, I always bump up the HP of monsters and NPCs as well - usually to 70-100% of maximum.
I like hit...