Hi
People start comming as early as 4:30 - 5:00 am, By 6:30 there is big line, They open door at 7:00.
If you have crossed 90 days then, the lady at the token counter will give you token number.
When your token number is called go to the counter, the officer will check the documents ( I-765 form, Copy of Reciept notice) if every thing is okay, He will ask you to wait till they call your name, this process take more than a hour.
Then they will call your name and give you a receipt and will direct you to another room, where you have again wait till they call you for Photo & Finger print
Then again wait for some time till they make the card ang give it to you.
Thats it.
Good luck