I picked up the DnD 5E Starter Kit today and we just played through the first encounter with the goblin ambush. I've never played before, let alone DMed, and it was only me and my girlfriend, so I played as a character too. I know I messed up a couple of things (I forgot the initiative bonus and the proficiency bonus), but I'm not sure if I got the hit points right.
Looking at the pre-generated character sheets, the Halfling Rogue has 9 hit points (1d8 plus Con modifier), but when I rolled damage from a Goblin arrow (1d6 + 2 piercing), it pretty much wiped me out in one hit! (they got the surprise attack on us)
I know I need to scale down the encounters when it's only 2 people playing, so there were only 3 goblins instead of 4, but it just seemed impossible, so I just basically bullsh*tted the hit points so we didn't both die straight away.
So can anyone tell me if I worked it out right or wrong? Or is it just something that will come with time and when I get to know the rules better?