Welcome to Gmail! Here is a checklist of things to get you started.
- Vacation Response
- Mail Handling Rules (Filters)
- Mail Forwarding
- Shared Mailbox Permissions
- Calendar Permissions
- Check Spam Regularly - Gmail's spam filter can sometimes be too good! Make sure you check your spam folder every so often to make sure something that you wanted didn't get flagged, then click Not Spam so it doesn't happen again!
Other useful articles to get you started: