I've already gone through the basics. My questions are a bit more specific than that. For example, where do I find the number of a document?
The document number is 8 or 10 characters, and is printed on the lower right corner of your DMV photo document, or on the back for documents issues after January 29, 2014. The 8 character format is all numeric.
Good to know. I was also asked for my SSN, why is that?
Entering the last 4 digits of your SSN is used only to help identify you for the transaction.