You might find some of these links useful:
Introductory Presentation for Year 7 students
Getting started with my Chromebook
How to connect to wifi at home
How to customise my desktop / shelf
How to set Chrome as my default browser
How to change my Chromebook password
How to use Google Keep
How to add an event to Google Calendar
How to add Reminders to Google Calendar
How to view your Classroom calendar
How to organise your Google Drive