The links below will provide help with all the new features of the Google applications available to you. 

General Gmail Help 

1. Creating and Sending Messages
2. Reading Messages
3. Receiving Messages
4. Deleting Messages
5. Attachments 
6. Spam
7. Searching for messages
8. Labels and Filters
9. Groupwise to Google Link

Managing Your Contacts

Moving Your Contacts from Groupwise

Using Google Calendar