Getting started with Microsoft CRM usually requires importing existing data; generally customer and contact information. This process is relatively easy to do.
As an example I imported new account and contact information into CRM Online. I imported the Account information first. I used the Import Data Wizard and the Default System Data Map. I chose to not map the Primary Contact because the contact information was not yet in the system:
The Imports screen will show your current import and past imports. There is also a nice feature connected to the Delete selection that allows you to delete the records that were created with a specific import.
You can click on the Import Name and see specific records that were imported successfully, and those that were not.
I created a short video to show this in action: http://youtu.be/nopJEi1abI4