Before start you must verify your account via mobile phone or credit card. Else it won't accept your app.
►1. First go to developer apps
►2. Allow the app for Enable developer Application,
►3. Now click on upper right corner "Create New App",

►6. You'll
see the next screen, entitled "Get Started with Open Graph" -- fill in
anything you want (it doesn't matter) in those fields under the heading
"start by defining one action than one object for your app." Click Get
Started.
►7. On this screen, do nothing except scroll to the bottom and click "Save Changes and Next." Do the same thing on the next screen.
►8. You'll
be taken to this screen. Wait a few minutes, and then go to your
Facebook homepage. That's where you'll be invited to enable Timeline. Be
patient at this point -- sometimes it requires you to wait before the
changes take effect.
►9. When you go back to your Facebook homepage, you'll see this. Success! Click Get It Now, and you're in!
►10. Here’s where you fiddle with your
timeline, set it up the way you like it, and when you click Publish Now,
your Timeline goes live. Or, you can wait until Thursday, October 9,
2011, and it’ll go live on its own. If you want to get into your
timeline from another computer, the address for this developer’s version
is located at this
URL: http://www.facebook.com/[yourusername]?sk=timeline and of course
[yourusername] is your own Facebook user name.
After this, you will be able to see timeline for your Facebook profile.