First, configure POP access:
http://mail.google.com/support/bin/answer.py?answer=13273

Second, configure Outlook (or one of many other email clients):
http://mail.google.com/support/bin/answer.py?answer=12103

Third, check your email.

Check out these posts too:

  1. How to use Outlook as the interface to Gmail
  2. What is Mail Fetcher?
  3. Using Gmail as Your Universal Email Account
  4. Yes you can access Google Email (Gmail) from Outlook
  5. Google has a 'Supported IMAP Client List' help section
  6. Better Google Analytics through URL tagging
  7. Manage mulitple email accounts in Gmail