You're now on your apps main page. In the left column, click on Open Graph. In the "People can" area add one of the following: Watch, Plan, read, review. In the next area, you'll be presented with a drop down of relevant choices. Choose one and hit "Get Started."

Wait a few minutes, head to your Facebook homepage and you should see your invitation to the new Facebook Timeline Beta.

Note: It's a beta, so whatever weirdness you encounter, it's on you. [TechCrunch]