When you sign in with a Google Account, all the email, contacts,
Calendar events, and other data associated with that account are
automatically synced with your tablet.
if you have multiple Google Accounts, you can add the others
Charge the battery
The printed Quick start Guide that comes with Nexus 7 contains
basic operating instructions for your new tablet.
The battery may not be fully charged at first. It's a good idea to
fully charge it as soon as you can.
Connect the micro usb cable to Nexus 7 and to the charging unit,
and the charging unit to a power outlet:
IMPorTAnT: use the charging unit and micro usb cable
that come with your Nexus 7. other charging units and usb
cables may charge more slowly or not at all.
Nexus 7 Guidebook