Purism 15 arrived, some scratches and no PureOS?

Hello,

The laptop didn’t come with PureOS preinstalled, which I was expecting (as well as the spanish keyboard…). So I installed it from the iso you provide.

What repositories should I add to the PureOS installation I just made?
Is there a big difference with installing Debian? By that I mean to ask if PureOS comes with special fine tuning for battery life and some other components which I wouldn’t have out of the box with Debian.

Thank you for your answer