I'm new to DMing, and I'm running the 5th edition starter set Mines of Phandelver. The starter set calls for 4 people, but my crew is 6.
I ran our first night tonight, to try and get a handle on DMing mechanics and stuff, thinking that if it was too easy for 6 that I would adjust it accordingly as we went through.
Needless to say, they have plowed through the first arc of the campaign with terrifying ease. Partially due to the fact that there is six of them, and partially just because they rolled pretty good stats.
How do I make this a little more challenging for them? I was thinking about just adding additional monsters, but is this a situation where I'd actually want to change enemy stats to make them more challenging? How would I go about doing something like that?